ci(core-web): block merges that add strict-mode violations (#37536)

[nicobytes]

Proposed Changes

Fixes #37536. Supersedes #37448.

PR #37403 merged the strict-gate harness to main on 2026-09-08 and wired it into nothing. Since then no pull request has been annotated, reported on, or blocked by it, and main has kept accumulating non-strict TypeScript exactly as before.

This wires it into CI as a blocking gate: a change that adds a strict-mode violation on a line it wrote does not merge.

File	Change
core-web/pom.xml	strict-gate execution in the validate profile + two activation profiles
core-web/tools/scripts/strict-gate/lib/format.mjs	job summary now states the run's cost (output only)
core-web/tools/scripts/strict-gate/format.duration.test.mjs	new — unit tests for the above
core-web/tools/scripts/strict-gate/README.md	no longer claims the gate is wired into nothing

CI only. No local git hook — core-web/.husky/ and lint-staged.config.mjs are untouched, so no contributor's local workflow changes. No workflow file changes. No new dependency.

It runs in two contexts, and both are load-bearing

Event	Role
pull_request	Where you read it. ::error file=,line=,col= lines render inline on the changed lines, plus a job summary.
merge_group	Where it is enforced.

That second row is the part worth reviewing. This repository declares no required status checks on main — the ruleset requires a pull request, one approval, thread resolution and signed commits, and no checks. So a red check on a pull request does not by itself stop a merge. A job that fails in the merge queue ejects the pull request, and that does.

Wiring only the pull_request half would have produced a gate that goes red and merges anyway. Trunk and nightly stay skipped — HEAD equals origin/main there, so the diff is empty and the run could only ever pass.

Maven property activation has no OR, hence two profiles rather than one condition. Activation reads the runner's own GITHUB_EVENT_NAME, which is why no workflow file needs to change.

Semantics

• successCodes lists 0 and nothing else. Findings (1) and a harness that could not run (2) both fail. A gate nobody has to obey is a report; a gate that reports "clean" without having looked is worse than no gate, because it is indistinguishable from a clean pull request.
• A 180 s <timeout> fails the same way, bounding the harness's unshallow git-fetch fallback (a full fetch here is ~1.1 GB / ~20 min).
• useMavenLogger is pinned false with a comment, even though it is the default — that default is the only reason the ::error lines reach the log at column 0 where GitHub can render them. Setting it true kills every annotation while leaving the build green.

Known gap, accepted knowingly

There is no escape hatch. A frontend change that legitimately must add a violation — porting legacy code, an unavoidable third-party shape — cannot merge until the violation is fixed or the gate is switched off repository-wide. No label, no per-file suppression.

The spike measured 0 false positives across its corpus (11 findings across 5 pull requests, all real), so the expected frequency is low, and inventing a bypass before anyone needs one tends to produce the bypass everybody uses. If this bites, say so on #37536.

Reviewer check

# Before this PR this is empty. After it, it must match.
git grep -n "strict-gate" -- core-web/pom.xml

Verified locally with the real CI command, on a branch carrying a deliberate TS7006:

Context	Expected	Result
No gate (before)	violation invisible	BUILD SUCCESS, no gate output at all
GITHUB_EVENT_NAME=pull_request	annotation + summary	::error …dot-utils.ts,line=270,col=35:: at column 0, summary table written
GITHUB_EVENT_NAME=merge_group, violation present	fails	BUILD FAILURE — Failed to execute goal …:exec (strict-gate) … Process exited with an error: 1

Activation measured with help:evaluate -Dexpression=skip.strict.gate:

GITHUB_EVENT_NAME	value	effect
pull_request	false	runs
merge_group	false	runs
push	true	skipped
schedule	true	skipped
unset (local)	true	skipped

Three deliberate deviations from the issue's acceptance list

1. It blocks. The issue scoped this non-blocking and named "flipping to blocking" under Out of scope. Being addressed on Wire the diff-scoped strict typecheck gate into CI — merged on main but never executes #37536 directly so the decision is recorded where the next reader looks.
2. No lint-staged.config.mjs hook, and no local hook of any kind.
3. <skip> keys off its own skip.strict.gate, not ${skip.validate}. The issue asks for the latter verbatim. Deliberate: a blocking gate that the documented way to silence its two neighbours also silences is not much of a gate. The flip side is that a plain local ./mvnw -Pvalidate runs lint and prettier but not this.

Worth recording for whoever picks up a local hook later — the harness compares two committed points, so a commit-time hook would examine the previous commit and report "clean" on the very violation being committed. That was verified, not theorised (checked 0 project config(s) against an uncommitted change). A local hook has to sit at push time, or the harness needs a notion of staged content. Reasoning preserved in specs/37536-wire-strict-gate-ci/spec.md under C-001/C-002.

Out of scope

• The template arm (2.2× compiler time on the largest app).
• The three untried closure optimisations.

Checklist

• Tests — 11 unit tests for the summary change, written first and confirmed failing before implementation. The Maven execution and annotation rendering have no automated test in this repo (no harness exists for POM behaviour; rendering belongs to GitHub); both underlying mechanisms were verified empirically with throwaway poms, and the composed result is verified by this PR's own CI run.
• Translations — n/a
• Security Implications Contemplated — no secrets, no new child-process invocation. The harness already invokes every subprocess with an argument array rather than a shell string, because refs and branch names come from pull-request metadata and are untrusted input; this PR does not weaken that.

Additional Info

The gate runs — confirmed. exec:3.0.0:exec (strict-gate) appears at line 1448 of job 104166954128, so the two-profile activation works and the harness is no longer dead code.

But this run proves less than that sentence suggests, and one finding from review changed the picture materially. That same run showed the gate had no merge base and was comparing against the tip of origin/main — which, with main deliberately not strict-clean, would have rejected authors for violations they never wrote. Fixed in 61f3fde by resolving the base from the event payload. Details on the review thread.

Still owed before merge: a throwaway branch carrying a deliberate TS7006, confirming exit 1, the annotation rendering inline on the diff, and the merge_group behaviour. This branch changes no .ts, so none of that is exercised yet.

What lands on the team: from the merge onward, a frontend pull request with a strict violation on a line it wrote will not merge. The spike's rate was ~2 findings per frontend pull request, all of them real.

Follow-up owed on the issue: observed duration and diff size from at least five real pull requests. The gate now sits on the critical path of every frontend merge, so if the real distribution is worse than the corpus suggested (8.4–9.4 s average, 12 s tail), the conversation is about making the harness faster.

Known unrelated redness: corpus.acceptance.test.mjs needs network access to the GitHub API and carries machine-dependent timing assertions. It is red offline both before and after this change; the other 10 test files pass with zero failures.

🤖 Generated with Claude Code

[claude]

Claude finished @nicobytes's task in 3m 0s —— View job

---

PR Review — strict-gate CI wiring

• Read the diff (cicd_comp_test-phase.yml, pom.xml, format.mjs, tests, specs)
• Check current state against prior review findings
• Look for new bugs / edge cases
• Post review

I focused on the code that landed after the two bot reviews — chiefly the new first-parent base resolution in cicd_comp_test-phase.yml (commit 39d10c3b), which neither bot saw — and re-checked every prior finding against the current tree.

New Issues

None blocking.

• 🟡 Medium: .github/workflows/cicd_comp_test-phase.yml:290 — when the --depth=2 fetch of $GITHUB_SHA fails (network, or the SHA is unfetchable), the || true swallows it, SECOND_PARENT is empty, and the gate falls back to --base=origin/main tip. Since the gate now blocks and main is deliberately not strict-clean (refactor(core-web): TS strict mode across all 44 projects — completes epic #35932 #37198), that fallback can reject an author for violations main introduced — the exact failure mode the first-parent design exists to prevent. It is surfaced only as a ::warning, not a hard failure. This is the same base-tip degradation already discussed on the pom.xml threads and deferred to a follow-up (--require-merge-base defaulting on for --format=github), so I'm flagging it for completeness, not as a new blocker. Assumption: fetching a merge SHA from origin is highly reliable on GitHub-hosted runners, so this path is rare. What to verify: that the follow-up issue captures "fetch-failure fallback under a blocking gate" and not only the "resolvable-but-no-common-ancestor" case.

Everything else in the workflow logic checks out:

• The two-parent guard correctly protects against a future switch to a head checkout: a non-merge HEAD has one parent, so SECOND_PARENT is empty and the gate degrades rather than silently diffing HEAD^1 (the previous commit) as if it were the base.
• STRICT_GATE_BASE → $GITHUB_ENV → strict.gate.base → --base is consistent, and the strict-gate-explicit-base profile activates only when the env var is present, so local runs keep the origin/main default.
• The --depth=2 deepen makes the first-parent commit object local, so the harness can diff parent1..HEAD directly without needing merge-base traversal on the shallow clone.

Resolved

• ✅ core-web/pom.xml — dangling .husky/pre-push reference gone; no husky/pre-push strings remain anywhere in the changed files.
• ✅ core-web/tools/scripts/strict-gate/lib/format.mjs:136 — costLine now counts distinct paths across targets[].files + unmapped[].path (no double-count, no dropped unmapped files), guards a partial durationMs (?s not NaNs), and renders sub-second runs in ms.
• ✅ format.mjs:146 — unmappedNote now renders in both the passing and findings branches.
• ✅ pom.xml — --base hardcoding resolved by the event-derived strict.gate.base; master-target case is now moot (compares against its own base). Redundant inherited plugin config block removed. Trunk/nightly/LTS "skip by event name, not empty diff" clarified. skip.strict.gate vs ${skip.validate} deviation documented. Timeout-watchdog mechanism comment corrected.
• ✅ format.duration.test.mjs — rewritten to assert equality on one extracted cost line (costLineOf); the four surviving mutations the reviewer found are closed, and the redundant doesNotMatch(/\b2\s*file/i) assertion that could never fail was deleted. 11 tests, boundary + NaN cases pinned.
• ✅ specs/.../data-model.md:87 — now documents the unique-path derivation including unmapped; no more phantom report.files.length.
• ✅ README.md — spike-vs-live contradiction reconciled.

The implementation is careful and the test suite is genuinely strong (equality on an extracted line, boundary values pinned, malformed-input guard tested). The one open item above is already tracked as a follow-up; the merge-queue attribution caveat (an earlier-queued PR's violation can eject the group) is a documented, accepted design tradeoff, not a defect.

· branch nicobytes/37536-wire-the-diff-scoped-strict-typecheck-gate-into-ci-merged-on-main-but-never-executes

[Copilot]

🟡 Changes recommended

Unresolved critical and moderate findings remain in CI wiring, reporting, and pre-push behavior.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

Activates the diff-scoped strict TypeScript gate for pull requests and adds local pre-push enforcement.

Changes:

• Wires the gate into Maven CI for pull requests.
• Adds pre-push enforcement.
• Adds duration reporting, tests, documentation, and specifications.

File summaries

File	Description	Review findings
specs/37536-wire-strict-gate-ci/spec.md	Requirements and acceptance criteria	No final review comments.
specs/37536-wire-strict-gate-ci/data-model.md	Outcome and duration model	Nit (2 votes): Documents report.files.length, which the implementation does not expose and cannot use for the documented diff-size calculation.
specs/37536-wire-strict-gate-ci/contracts/ci-hooks.md	CI and hook contracts	No final review comments.
core-web/tools/scripts/strict-gate/README.md	Gate documentation and status	Nit (1 vote): Contradictory “spike” and “wired and live” status wording.
core-web/tools/scripts/strict-gate/lib/format.mjs	Duration and summary formatting	Moderate (1 vote): Omits unmapped files from both summary branches. Moderate (3 votes): Reports assignment counts rather than unique changed files, excluding unmapped files from the measurement.
core-web/tools/scripts/strict-gate/format.duration.test.mjs	Duration summary tests	No final review comments.
core-web/pom.xml	Pull-request Maven gate execution	Critical (1 vote): Hard-codes origin/main, producing incorrect or failed comparisons for master pull requests. Moderate (1 vote): GitHub output lacks the scope/dependency-discard preamble.
core-web/.husky/pre-push	Local strict-gate enforcement	Moderate (3 votes): Runs the toolchain without a changed-path preflight for non-frontend pushes. Moderate (1 vote): Mislabels exit-2 execution failures as violations. Moderate (1 vote): Relies on potentially stale origin/main, diverging from CI.

Review details

Suppressed comments (6)

core-web/.husky/pre-push:52

• The hook ignores the refs supplied on pre-push stdin and always checks HEAD. A valid git push origin other-local-branch:remote-branch (or a multi-ref push) can therefore be allowed or refused based on a different commit than the one being sent. Parse the local ref/SHA from stdin, skip deletions, and pass that SHA as --head, or explicitly restrict the hook to current-branch pushes.

pnpm exec node tools/scripts/strict-gate/run.mjs \
    --base origin/main \
    --head HEAD \

core-web/.husky/pre-push:68

• For exit 2 (for example, an unresolved base or unreadable project graph), the harness may print no violations, but this wrapper still tells the developer to “Fix the violations above.” That misclassifies a harness failure and obscures the recovery path; distinguish findings (1) from a gate execution error before printing this guidance.

    echo "Push refused by the strict-gate check (exit $status)."
    echo "  Fix the violations above, or push anyway with:  git push --no-verify"

core-web/.husky/pre-push:51

• This local invocation assumes origin/main is current, but the hook never refreshes the remote-tracking ref; CI explicitly fetches origin/main immediately before Maven. A developer with a stale ref can therefore get a different result from the pull-request run, violating the documented claim that local and remote answers agree. Refresh the target base (or make the freshness prerequisite explicit and enforce it) before running the check.

pnpm exec node tools/scripts/strict-gate/run.mjs \
    --base origin/main \

core-web/pom.xml:518

• --format=github emits only ::error annotations; formatGithub() does not emit the required scope/dependency-discard preamble. The new CI log therefore starts with findings without telling agents that only changed lines are in scope (the separate Markdown summary does not change the formatter output). Add the scope preamble to the GitHub formatter before enabling this invocation.

                                        <argument>--format=github</argument>

core-web/tools/scripts/strict-gate/README.md:80

• This new section says the gate is "Wired and live", but the unchanged introduction still says "This is spike output, not production tooling" (line 9). After adding CI and pre-push enforcement, that description is contradictory and can lead contributors to treat the live hooks as unsupported or removable spike artifacts. Update the introduction/status wording to reflect that this is now temporary production tooling.

**Wired and live since #37536.** Two invocation points, deliberately asymmetric:

core-web/tools/scripts/strict-gate/lib/format.mjs:146

• formatMarkdown is the job summary used by the new --format=github CI path, but the pass branch never renders report.unmapped (and the findings branch omits it too). A changed TypeScript file that no project claims therefore appears as a clean pass with no indication that it was unexamined, contrary to the gate's edge-case contract; include the unmapped files/reasons in both summary branches.

            costLine(report)

• Files reviewed: 8/8 changed files
• Comments generated: 4
• Review effort level: Lite

---

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[nicobytes]

Thanks — triaged all of it. Fixed in db56f5b.

Important context for anyone reading the bot reviews above: both were produced against earlier commits. Copilot reviewed the first push, which still contained core-web/.husky/pre-push; that hook was removed afterwards, so its four pre-push findings (stdin refs, exit-2 mislabel, stale origin/main, no changed-path preflight) no longer apply to any committed code. The Claude review caught the PR body still describing that hook — that was real, and the description has since been rewritten (the PR also became blocking, which it was not when either bot looked).

Fixed

🟠 Dangling core-web/.husky/pre-push reference in pom.xml — correct, and my mistake. When the hook was cut I updated the properties comment and missed this one inside the execution block. A developer would have gone looking for a file that was never added. Removed.

🟡 costLine counted assignments, not changed files — correct and the sharpest finding here. selectConfigs claims a source under every eligible config, so a project whose lib and spec configs both include a file yields two target entries for one changed file; targets[].files.length summed them and reported a one-file diff as two. Unmapped files were dropped entirely. Both defeat the only reason that line exists. Now counts distinct paths across targets[].files and unmapped[].path.

You were also right that the existing test never exercised it — it used distinct files across targets. Two new cases pin the two failure modes directly, and both were confirmed failing before the fix.

🟡 formatMarkdown never rendered unmapped — correct, and worse now the gate blocks: a changed TypeScript file that no project compiles read as a clean pass with nothing said about it, which is the edge case the spec names. The summary now lists them with the reason, in both the passing and the failing branch. Deliberately not a failure signal — it is the difference between "nothing was wrong" and "nothing was looked at".

🟡 data-model.md documented report.files.length — correct, no such field exists. Rewritten to describe the unique-path derivation including unmapped, so the contract and the implementation now say the same thing.

🟡 README contradiction — correct. "This is spike output, not production tooling" sat directly above a section saying it is wired and live. Reconciled.

Not changed, with reasons

🔴/🟡 --base=${git.origin.branch} hard-codes origin/main while the workflow also triggers for master PRs — the trigger list is real (cicd_1-pr.yml lines 25-29), but origin/master does not exist in this repository (git ls-remote --heads origin master returns nothing), so no pull request can target it today. This is latent, not active.

Two things make me want to leave it: the property is the pre-existing ${git.origin.branch} that lint-test and format-test already use, so the gate introduces no new divergence; and resolving the real base branch would add an untestable code path for a branch that does not exist. The bot's sharper point stands and is worth recording though — strict-gate is the first place where an unresolved base fails the build rather than degrading quietly. If master is ever created, this needs fixing first.

🟡 --format=github emits no scope preamble — accurate: formatGithub emits only ::error lines, and the scope rule lives in the Markdown job summary that the same run writes to $GITHUB_STEP_SUMMARY. So a human on the run page does get it; an agent scraping raw log lines does not.

That is a real concern and it is exactly what the harness's own design notes worry about. I am leaving it because changing the shape of the annotation output is more than the output-only carve-out this PR is operating under, and it is a harness design question from #37403 rather than something this wiring introduced. Worth its own issue if it bites.

Verification

• 7/7 duration tests green (3 of them new, all confirmed Red first)
• The 10 non-network harness test files pass with zero failures
• core-web/pom.xml parses; prettier --check clean

corpus.acceptance.test.mjs remains red offline both before and after — it resolves its corpus through the GitHub API and carries machine-dependent timing assertions.

[oidacra]

The gate ran in this PR's own CI (job 104166954128) and printed:

strict-gate: warning — no merge base between 'origin/main' and head;
comparing against the tip of 'origin/main' instead.
Findings may include changes the base introduced.

The cause looks structural rather than incidental: cicd_comp_test-phase.yml:259 checks out at fetch-depth: 1, and the compensating step at :266 is git fetch --depth=1 origin main:refs/remotes/origin/main. Both sides are depth-1, so git merge-base can't traverse, and the harness takes its documented fallback in lib/changed-files.mjs:81-94.

Is that fallback acceptable now that the gate blocks? The harness's own comment above that code says it is the path that "produced the run that reported 50 findings, essentially none of them the branch's own". It was survivable while the only other --base=origin/main consumer was nx affected, because over-including projects for lint is harmless on a lint-clean main. But main is deliberately not strict-clean — that's the premise of #37198 (workspace-wide strict migration) — so every line main moved ahead of the PR's merge ref gets strict-checked and can fail the build with violations the author cannot fix.

On merge_group this looks worse rather than better: HEAD there is the queue's temp commit sitting on main plus every PR ahead of this one, so with no merge base those other PRs' .ts changes appear as this PR's diff. Would a strict violation in an earlier-queued PR eject this one, annotated on lines its author never wrote?

Worth noting the "0 false positives across the corpus" figure was measured with a correct merge base, so I don't think it transfers to the configuration the gate actually ships in.

One option that keeps the shallow checkout — derive the base from the event payload:

env:
  BASE_SHA: ${{ github.event.pull_request.base.sha || github.event.merge_group.base_sha }}
run: |
  git fetch --depth=1 origin main:refs/remotes/origin/main
  if [ -n "$BASE_SHA" ]; then git fetch --depth=1 origin "$BASE_SHA"; fi

plus -Dgit.origin.branch=$BASE_SHA on that suite's Maven args. With the base already at the true divergence point the base-tip fallback becomes exactly correct rather than a degradation — and it makes the hardcoded origin/main-vs-master point raised separately moot. Alternatively fetch-depth: 0 with filter: blob:none gives full history without the ~1.1 GB pack the comment below warns about.

[nicobytes]

Confirmed and fixed in 61f3fde. This was the one that would have made the gate unusable, and your diagnosis of the cause was exactly right — I reproduced the warning in the job log before changing anything.

Took the event-payload option. cicd_comp_test-phase.yml now resolves pull_request.base.sha || merge_group.base_sha, fetches that single commit shallow, and hands it to the gate through a new strict.gate.base property. With the base already at the divergence point the base-tip fallback stops being a degradation and becomes exactly right — no deepening, no extra pack.

Two deliberate choices inside that:

• strict.gate.base is its own property, not a change to ${git.origin.branch}. Your framing is why: lint and format tolerate an approximate base, this does not. Repointing the shared property would have silently changed both neighbours, and widening the blast radius is not something this change should do quietly. It defaults to ${git.origin.branch}, so a local run is unchanged.
• The fetch failing is not a new failure mode. If the base commit cannot be fetched the step emits a ::warning and leaves the gate on origin/main — today's behaviour, not a hard fail.

You are also right that this settles the hardcoded-origin/main point you raised separately: a pull request targeting something other than main now compares against its own base. I have closed that thread pointing here.

On merge_group: merge_group.base_sha is the commit the queue group is based on, so the diff still spans every pull request in the group. A violation introduced by an earlier-queued pull request can therefore eject the group. I think that is defensible — the queue is testing "main plus these changes" and that combination genuinely has a violation, and the annotation names the file and line — but it is not clean attribution and I would rather it be written down than discovered. Noted in the workflow comment.

The point about "0 false positives" not transferring is the one I would most want on the issue, so I have added it there.

[nicobytes]

Follow-up on the master half of this, which your other comment raised separately: 61f3fde makes it moot rather than fixing it directly. The base now comes from pull_request.base.sha, so the base branch's name stops mattering — a pull request targeting anything compares against its own base.

For the record, origin/master does not currently exist (git ls-remote --heads origin master is empty), so the case was latent rather than active. It is now structurally unreachable instead of merely unused.

[oidacra]

successCodes listing only 0 is the change I'd most want recorded on the issue before this merges.

Issue #37536 says verbatim under Scope decision: "Non-blocking (reporting only) in this issue. The blocking flip stays out of scope", its acceptance list carries the exact XML with <successCode>0</successCode><successCode>1</successCode>, and "flipping to blocking" is named under Out of scope. The spike (#37401 / PR #37403) recommended shipping non-blocking first for the runtime reason — 8.4-9.4s average, 12s tail against a 10s budget — and the README in this PR repeats those numbers unchanged.

The PR description argues the reversal and I find the argument persuasive on its merits. My concern is procedural: the issue is the reviewer-facing contract and it currently says the opposite of what ships, with no visible re-approval, and the "observed runtime from at least five real pull requests" that the issue wanted before a blocking decision doesn't exist yet.

Would you update #37536's scope and acceptance list to match, so the decision is recorded where the next reader looks, rather than only in this PR's description?

[nicobytes]

Fair, and the procedural objection is the right one to raise — the issue is the reviewer-facing contract and it currently contradicts what ships.

For the record of how it moved: the issue scoped this non-blocking, I built it that way, and the reversal came from the author asking for a gate that actually prevents the merge. That is a legitimate change of mind, but you are right that it lives only in this PR's description, with no re-approval and without the five-pull-request runtime evidence the issue wanted first.

I will update #37536's Scope decision and acceptance list to match what ships, and record the merge-base finding above in the same edit — that one materially changes the picture, because the spike's precision number was measured under a different configuration than the gate was about to ship in.

Holding the merge until that is done and someone has looked at it.

[oidacra]

This comment states the doctrine clearly: "a gate that reports 'clean' without having looked is worse than no gate, because it is indistinguishable from a clean pull request."

ensureBaseRef applies that rigorously to an unresolvable base — it throws rather than report an empty diff. But an unusable base (resolvable, yet with no common ancestor) only prints a warning to stderr and proceeds. Combined with useMavenLogger=false, that warning lands as an unprefixed line in the middle of a six-minute Maven log.

Isn't that the same class of silent degradation this comment rules out? Would it be better for run.mjs to exit 2 when the base resolution falls back to base-tip — optionally behind --require-merge-base, default on for --format=github — and emit it as ::error:: so it surfaces?

One caveat if you take this: it's only safe to land together with a fix for the base-SHA problem, otherwise it red-lights every frontend PR on day one.

[nicobytes]

Good distinction, and I think you are right that the two cases are not being treated consistently: an unresolvable base throws, an unusable one warns and proceeds. Under useMavenLogger=false that warning is an unprefixed line in the middle of a long log, which is close to not reporting it at all.

I have not made the change, and your own caveat is why — landing it before the base fix would red-light every frontend pull request on day one. Now that 61f3fde supplies a real base, the fallback should be rare enough that failing on it is safe rather than catastrophic.

I would rather not do it in this pull request though. Exiting 2 on base-tip changes the harness's decision logic, which is the one line this change has held to not crossing (the elapsed-time line is output-only and was called out as the single exception). It also wants its own verification: a case where the base resolves but has no common ancestor, which none of the current tests construct.

Proposing it as a follow-up issue rather than folding it in — with --require-merge-base defaulting on for --format=github, as you suggest. Tell me if you would rather it block this one.

[oidacra]

The verb here reads as contradicting the note printed two lines below it. With one mapped and one unmapped file the summary renders:

_Checked 2 changed file(s) across 1 project config(s) in 12.4s._

**1 changed file(s) were not examined** — no project configuration claims them:

Two adjacent lines asserting the opposite thing about the same file. Beyond the wording, this number is the SC-005 evidence the duration is meant to be normalised against, so a count that includes files the compiler never touched isn't the cost-per-checked-file it reads as.

The JSDoc just above shows the intent was understood ("they were changed, they just were not examined") — it looks like only the verb didn't follow. Would something like this work?

return `_${changed} changed file(s) across ${report.targets.length} project config(s), ${seconds}s._`;

or, if the split is worth surfacing: _Checked ${changed - report.unmapped.length} of ${changed} changed file(s) …_

Note this would mean updating the assertion in format.duration.test.mjs too.

[nicobytes]

Agreed — two adjacent lines asserting the opposite thing about the same file. Fixed in 78980a7 by dropping the verb entirely:

_2 changed file(s) across 1 project config(s), 4.0s._

Went with your first option rather than Checked X of Y. The note below already states how many were not examined, so the split would have said it twice, and Checked 3 of 3 on the common case reads like a puzzle. The line now states diff size and duration; what was skipped is the note's job.

Test assertions updated to exact equality on that string, per your other comment.

[oidacra]

Two questions about this note now that the gate blocks.

exitCode is derived solely from findings (lib/report.mjs:60), and unmapped is read nowhere else in the harness — so a changed .ts that no project config claims produces a green check and merges. The spec asks for these to be reported rather than failed, so the implementation is compliant and I'm not calling it a bug. But an unmapped file is precisely a file the gate did not look at, and it's the one such case resolved in favour of passing — which sits awkwardly next to the "worse than no gate" principle quoted in the POM.

Second, formatGithub is unchanged (correctly, since a note has no file/line to attach to), so this produces no annotation at all. It lives only in the job summary, which is the page nobody opens on a green run. So the case most in need of being seen is in the place least likely to be looked at.

Would a ::warning annotation for unmapped changed sources be worth adding, so it surfaces on a passing run? And is exit 0 still the right call now that this is the enforcement point rather than a report?

[nicobytes]

Both questions are fair and I have only half-answered them.

Fixed: the note now renders in the findings branch too, not just the passing one. Your other comment caught that the two unmapped tests both used the clean fixture, so the findings branch was unenforced — there is a case for it now.

Not fixed, deliberately: exit code and annotations. Adding a ::warning means touching formatGithub, and changing exit 0 means touching report.mjs — both are the harness's decision logic, which this change has held to not crossing. The output-only carve-out was explicitly scoped to the elapsed-time line.

But I think you are right on the merits, and the asymmetry you describe is real: the one case where the gate demonstrably did not look is the one resolved in favour of passing, and it reports only to the page nobody opens on a green run. That sits badly next to the "worse than no gate" line I quoted in the POM.

Rolling it into the same follow-up as the base-tip question, since both are "the harness is quiet about something it should not be quiet about". A ::warning seems clearly right; whether it should fail is the harder call and I would rather it be taken with the unmapped rate measured rather than guessed.

[oidacra]

I reconstructed both sides of this change in a sandbox and ran six mutations of the implementation against this suite. Four survive:

• project-config count replaced with new Set(targets.map(t => t.project)).size — 7/7 pass
• duration emitted on a separate line from the file count, defeating this test's stated purpose ("paired with the size of the diff that produced it") — 7/7 pass
• the blank line before the findings table removed, so GitHub stops rendering it as a table — 7/7 pass
• unmappedNote dropped from the findings branch entirely — 7/7 pass

That last one is because both unmapped tests use the clean fixture, so "a changed file nobody compiled must be named" is enforced on pass and unenforced on fail — the branch an author is actually reading.

The common cause looks like the whole-summary regexes: formatMarkdown returns a multi-line document, and unmappedNote emits **N changed file(s) were not examined**, the same number-then-file shape these regexes look for. I confirmed a false pass — with targets: [] and two unmapped files, a costLine that drops unmapped renders Checked 0 changed file(s) and /\b2\b[^|\n]*file/i still matches, satisfied by the note.

Would exact equality on an extracted cost line be preferable? It's also how the sibling suite asserts (hunks.test.mjs, report.contract.test.mjs use assert.deepEqual/assert.equal, reserving assert.match for free-text fields deliberately left unpinned):

const costLineOf = (summary) => {
    const line = summary.split('\n').find((l) => l.startsWith('_Checked '));
    assert.ok(line, 'the summary must carry a cost line');
    return line;
};
assert.equal(costLineOf(summary), '_Checked 3 changed file(s) across 2 project config(s) in 9.0s._');

That single change closes this and the two findings below it. A findings-branch case carrying both a finding and an unmapped entry would close the other two mutations.

Separately: the PR checklist says "4 new unit tests" — the file contains 7 (# tests 7 from the runner). Worth correcting so a reviewer counting against the claim doesn't go looking for a missing file.

For what it's worth, the TDD claim checks out: I ran this file against the pre-PR lib/format.mjs and got 0 pass / 7 fail.

[nicobytes]

This is the most useful review comment I have had on anything. Rewritten in 78980a7.

You are right about the cause: whole-document regexes against a multi-line document, where the unmapped note renders the same number-then-file shape the assertions were looking for. I reproduced your targets: [] + two-unmapped case and confirmed the false pass — the assertion was satisfied by the note while the cost line read 0 changed file(s).

Took the costLineOf suggestion, and it does close all four mutations. The suite is now equality against one extracted line, which as you note is what hunks.test.mjs and report.contract.test.mjs already do. I also added the two cases you identified as missing: a findings-branch fixture carrying both a finding and an unmapped entry, and an explicit assertion that a blank line precedes the findings table.

11 tests now. Corrected the "4 new unit tests" claim in the PR description — thank you for counting.

[oidacra]

I think this assertion can't fail for the bug it was written to catch.

The bug it targets is summing targets[].files.length. I ran that mutation — the buggy output is:

_Checked 2 changed file(s) across 2 project config(s) in 5.0s._

/\b2\s*file/i requires 2, optional whitespace, then literally file — but the real string has changed in between, so the regex doesn't match and doesNotMatch passes against the buggy output. Node's failure report confirmed only line 121 fired; this line never did.

It's also the only assertion in the file with no message string, which may be how it escaped notice.

Delete it as redundant with line 121, or pin the actual phrasing?

assert.doesNotMatch(summary, /Checked\s+2\s+changed file/i, 'the two config entries must not be counted as two files');

[nicobytes]

You are right, and it is worse than redundant — it could never have failed for the bug it was written to catch. /\b2\s*file/i needs 2, optional whitespace, then file; the real output is 2 changed file, so \s* never spans changed. I confirmed the same way you did: only the line above ever fired.

Deleted rather than re-pinned. The assertion above it is now equality against the extracted cost line, which covers this case exactly and without a regex that can drift out of sync with the wording again.

Your observation about it being the only assertion with no message string is a good tell — I will treat a bare assertion as a smell in this file from now on.

[oidacra]

This fixture may be picking a value that was never at risk. (0.331).toFixed(1) is "0.3" — three rounding steps clear of the boundary. The value that actually produces the forbidden output is anything under 50ms: I confirmed total: 40 renders in 0.0s.

The premise in the comment also looks off by roughly 2x. I timed the real no-op path (node run.mjs --base HEAD --head HEAD, which early-returns after resolveChangedFiles) three times: durationMs.total came back 173.2 / 176.8 / 179.9 ms, so ~0.2s rather than ~0.3s. That's within a factor of four of the 0.0s cliff, which makes it reachable on a faster runner with a warm git cache.

So "sub-second runs must not round to zero" is asserted for a safe value while the implementation genuinely does render 0.0s at the fast end. Would you test the boundary instead, and either accept 0.0s and soften the comment, or switch costLine to sub-second precision below a threshold?

One more on line 162: doesNotMatch(summary, /\b0\.0\s*s\b/) scans the whole document, so it forbids 0.0s anywhere. I mutated costLine to append a legitimate (typescript 0.0s) breakdown and this test failed for a reason unrelated to rounding.

[nicobytes]

Confirmed, and the implementation was genuinely wrong here — not just the fixture. I wrote your boundary case as a test first and it failed: total: 40 rendered 0.0s.

So rather than move the fixture, I changed costLine. Sub-second runs now render in milliseconds:

_0 changed file(s) across 0 project config(s), 40ms._

Your timing is the reason — ~175ms measured on the real no-op path is a factor of four from the cliff, which is reachable, and the no-op is the most common outcome the evidence has. Rounding the commonest case to zero would have quietly hollowed out the measurement.

Also took the scoping point on line 162: the assertion now runs against the extracted cost line rather than the whole document, so a legitimate 0.0s elsewhere in the summary cannot trip it. And added a companion case pinning that a run at exactly 1000ms still renders as 1.0s, so the two branches of the threshold are both held.

[oidacra]

Is this the actual mechanism? The skip is GITHUB_EVENT_NAME not matching pull_request or merge_group — the diff is never computed on trunk or nightly, because the execution doesn't run at all.

The distinction matters because the stated reason is false for cases that are nonetheless skipped. Both cicd_3-trunk.yml and cicd_4-nightly.yml also accept workflow_dispatch, and a dispatch from a feature branch has HEAD != origin/main. cicd_4-nightly.yml:139 sets change-detection: 'disabled', so the frontend filter defaults to true and the Frontend Unit Tests job runs with -Pvalidate on every nightly — it's the event name, not an empty diff, keeping the gate quiet there.

As written, this invites a future reader to enable push on the belief it would be a no-op. Would something like this be more accurate?

"Every other event leaves skip.strict.gate at true. On trunk/nightly that is also what you'd want — HEAD is origin/main, so there would be nothing to report — but the skip is by event name, not by diff emptiness."

The same sentence appears in the README's "Where this runs" section.

[nicobytes]

You are right, and the wording invited exactly the mistake you describe. Corrected in 78980a7.

I checked each of your claims before rewriting: cicd_3-trunk.yml and cicd_4-nightly.yml do both accept workflow_dispatch, and cicd_4-nightly.yml:139 does set change-detection: disabled, so the frontend suite runs nightly with -Pvalidate regardless of paths. The skip there is the event name and nothing else.

The comment now says so, and carries the warning forward explicitly — that adding a push profile on the belief it would be a harmless no-op is wrong for cases that are nonetheless skipped today. I folded in the cicd_5-lts.yml point from your other comment in the same paragraph, since it is the same trap.

The README sentence you flagged has been reconciled too.

[oidacra]

"Emitted on every run" may be broader than what happens. costLine is only called from formatMarkdown, never from formatGithub — and --format=github is what the POM passes, so formatGithub is what reaches stdout and the build log. The cost line arrives only via run.mjs's separate GITHUB_STEP_SUMMARY write, which format.mjs doesn't itself check.

This PR's own CI run bears that out: the gate printed nothing to the log except the merge-base warning.

So for anyone reading annotations or the Maven log, the cost line never appears. Would you narrow the wording, e.g.:

"Emitted on every markdown-formatted run, passing ones included. Note that formatGithub — the format this repo's CI invocation uses — does not call this; the cost line reaches GITHUB_STEP_SUMMARY via run.mjs's separate markdown write, not stdout or annotations."

[nicobytes]

Correct, and the wording was overclaiming. Narrowed in 78980a7 to say where it does not appear — that formatGithub, which is the format this repo's CI invocation passes, never calls this, so the line reaches the run page only through run.mjs's separate GITHUB_STEP_SUMMARY write, never stdout and never an annotation.

Your point that this PR's own run bears it out is the part that made me fix the comment rather than argue with it: the log carried nothing but the merge-base warning.

That merge-base warning is now fixed in 61f3fde, and separately I have added a note to the follow-up issue about the gate being silent on a clean run — you raised the same thing on the pom.xml:509 thread and it is the more useful half of this observation.

[oidacra]

Two smaller things about this line.

report.durationMs.total has no guard. It isn't reachable through run.mjs today — buildReport defaults durationMs and both collectDiagnostics return paths populate all three fields — but formatMarkdown is exported, and buildReport's parameter default only fires on undefined, not on a partial object. A durationMs: {} renders in NaNs. in the job summary. Given this file's own stance that a plausible-looking wrong number is the dangerous failure mode, would a guard be worth the line?

const ms = report.durationMs?.total;
const seconds = Number.isFinite(ms) ? (ms / 1000).toFixed(1) : '?';

Separately: neither costLine nor unmappedNote reaches formatText, which is the CLI default and therefore what a developer gets from the local invocation the README recommends. FR-018 only mandates the summary so this is in spec, but the reasoning in the new JSDoc ("the real distribution is worth knowing") seems to apply equally to the local run. Deliberate scope call, or worth the two lines?

[nicobytes]

Both taken, in 78980a7.

The NaN guard is in, phrased as you suggested — and you are right that this file's own stance is what makes it worth the line: a summary reading in NaNs. is precisely the plausible-looking wrong number it exists to avoid. I added a test pinning it, which renders ?s rather than NaNs.

On formatText: leaving it out for now, and I want to be straight that this is a scope call rather than a principled one. You are right that the reasoning applies equally to the local run — a developer running the README's recommended invocation gets no cost line at all. It is two lines. I am holding it only because formatText is untouched by this change today and I would rather not grow the diff while the merge-base fix is the thing under review. Say the word and I will add it.

[oidacra]

I checked this claim against gh api repos/dotCMS/core/rulesets and it is accurate right now: the active ruleset on main carries required_signatures, pull_request (1 approving review, thread resolution required) and non_fast_forward, and defines no required_status_checks.

Two things worth knowing, since this premise is what the whole two-profile design rests on:

• The ruleset providing it is an org-level one named 2026-08-24_incident-response, created 2026-08-24. The name suggests a reactive posture rather than the durable state of branch protection.
• A separate ruleset, Default Merge Queue, does define required_status_checks (semgrep, Finalize/Final Status, Initialize/Initialize) but currently has enforcement: disabled.

So the claim holds today, but only while that incident-response ruleset stays active and the checks-based one stays disabled. Would it be worth noting that dependency here, so whoever re-enables Default Merge Queue sees that this design assumed the opposite?

[nicobytes]

Thank you for actually checking this against the API rather than taking the comment's word — the whole two-profile design rests on this premise and I had verified it only as a snapshot.

Both caveats are now in the comment: that the ruleset providing it is the org-level 2026-08-24_incident-response, and that Default Merge Queue does define required_status_checks with enforcement: disabled. The point about the name suggesting a reactive posture rather than durable state is the one worth preserving, so the comment says the premise holds today and names what would invalidate it.

Whoever re-enables that ruleset now has a chance of seeing that this design assumed the opposite.

[oidacra]

The PR description is careful to say a green build shouldn't be read as proof the gate ran — and it did run, which I confirmed in the log. But I don't think this run exercises the mechanism this comment is protecting.

This PR changes zero .ts files, so the harness returned in 0.37s having compiled nothing. The ::error file=... at column 0 to inline-annotation chain, the exit-1 blocking path, and the new cost line are all still unexercised, and the issue's acceptance criterion "a pull request touching core-web TypeScript shows inline annotations on the diff and a job summary" therefore has no evidence behind it yet.

Before merging something that can eject PRs from the merge queue, would you run one throwaway branch carrying a deliberate TS7006 and confirm three things: exit 1, the annotation actually rendering on the diff, and the behaviour under merge_group? A screenshot on the issue would close the AC.

Related observability point: on the clean run the gate printed nothing but the merge-base warning — there's no way to distinguish "ran and was clean" from "ran and had nothing to look at" from the log alone. A one-line success summary on stdout would make that visible the moment it matters.

[nicobytes]

You are right that the run proves less than the description implies, and the merge-base finding on your other thread has since made that gap matter more rather than less.

To be precise about what the run did establish: the strict-gate execution appears in the log at line 1448, so the two-profile activation works and the gate is no longer dead code, which was the open question when I opened this. Everything past that point — annotations rendering on a diff, exit 1 ejecting from the queue, the cost line — is unexercised, exactly as you say, because this branch changes no .ts.

I will run the throwaway branch with a deliberate TS7006 and post the three confirmations plus a screenshot on #37536 before this merges. Doing it after 61f3fde rather than before, so it exercises the base the gate will actually ship with.

Locally I have confirmed exit 1 fails the build under GITHUB_EVENT_NAME=merge_group (BUILD FAILURE, Process exited with an error: 1) and that the annotation reaches the Maven log unprefixed at column 0 — but that is my machine, not the thing you are asking for, and the inline rendering step is precisely the part a local run cannot demonstrate.

Your observability point is the one I had not considered: on a clean run the gate prints nothing, so "ran and was clean" and "ran and had nothing to look at" are indistinguishable from the log. That is a small version of the failure this whole issue is about. Added to the follow-up.

[oidacra]

Is this block needed? The profile's plugin entry merges into the base <build> plugin block, so the base plugin-level configuration at lines 123-166 already applies to strict-gate.

I verified with ./mvnw help:effective-pom -pl :dotcms-core-web -Pvalidate under GITHUB_EVENT_NAME=merge_group: the effective strict-gate execution shows both the PATH and NODE_OPTIONS=--max-old-space-size=6144 from the base, even though this block never mentions NODE_OPTIONS. Deleting these seven lines appears to change nothing. (The pre-existing executions are unaffected either way — all six still show the identical executable, workingDirectory and NODE_OPTIONS.)

The reason I'd rather see it go than stay: it duplicates PATH in two places without duplicating the comment at lines 126-131 explaining why the Node dir is prepended. A future edit to the base PATH (a second dir, a different shim) silently wouldn't reach this copy, and nothing would fail — the strict-gate would just pick up the runner's default Node.

If you'd rather keep it belt-and-braces, would a one-line comment noting the plugin-level config is inherited from the base <build> be worth adding?

[nicobytes]

Verified and removed in 78980a7. I reproduced your help:effective-pom check under GITHUB_EVENT_NAME=merge_group and the effective strict-gate execution does carry NODE_OPTIONS even though the block never mentioned it, which proves the base configuration merges in and the block was doing nothing.

Your reason for preferring it gone is the one that convinced me: it forked the PATH comment at 126-131 into a copy that a future edit to the base would silently miss, and the failure would be invisible — the gate would just pick up the runner's default Node.

Replaced with a comment saying the plugin-level configuration is inherited and why there is deliberately none here, so the next person does not re-add it.

Worth noting a mistake I made fixing this: my first pass replaced the identical block in the pre-existing format profile as well. Caught it before pushing and restored it byte-for-byte; core-web/pom.xml is now purely additive against main.

[oidacra]

lint-test and format-test key off ${skip.validate}; this keys off a new property. So -Pvalidate -Dskip.validate=true — the documented way to turn off the other two checks — disables lint and prettier but leaves the blocking strict gate running.

I assume that's intentional, given the design goal that the gate be hard to opt out of. But it isn't mentioned in the property comment at lines 26-38, and the issue's acceptance criterion asked specifically for <skip>${skip.validate}</skip>, so this is a deviation that isn't among the two the PR description declares.

Also worth stating explicitly somewhere: a plain local ./mvnw -Pvalidate runs lint and prettier but not this, unlike its two neighbours. The comment at 463-474 covers the intent; it's the asymmetry with skip.validate specifically that I think needs a sentence. Something like: "-Dskip.validate=true does not turn this off; it has its own property by design."

[nicobytes]

Intentional, undocumented, and you are right that it is an undeclared deviation — the issue's acceptance list does ask for <skip>${skip.validate}</skip> verbatim.

The intent is what you assume: a blocking gate that the documented way to silence its two neighbours also silences is not much of a gate. But that reasoning was in my head and nowhere else.

Added to the property comment in 78980a7, close to your phrasing, and with the flip side stated too — that a plain local ./mvnw -Pvalidate runs lint and prettier but not this, unlike its neighbours. I will add it to the PR description's deviations list as a third entry rather than leaving it implied.

[oidacra]

I pulled META-INF/maven/plugin.xml from exec-maven-plugin 3.0.0 to check this, and the parameter and the 180s bound are both real. Two notes on the mechanism the comment describes.

The build does fail on timeout, but not through successCodes — the watchdog path throws MojoExecutionException from the ExecuteException branch ("Timeout. Process runs longer that N ms.") and never consults successCodes at all. Harmless as written, but it teaches a mechanism that isn't there: someone adding <successCode>143</successCode> to "allow timeouts" would find it has no effect.

Second, and more of a question than an assertion: commons-exec's watchdog destroys the direct child (pnpm), not the node grandchild that pnpm exec spawns. If the grandchild survives holding the stdout pipe, PumpStreamHandler.stop() can block joining its pump thread — which would mean the 180s ceiling isn't the hard wall described here. I didn't exercise this, and I'm flagging it only because boundedness is the whole justification for the parameter. If you want certainty cheaply, keeping the Maven timeout as a backstop and adding an internal deadline inside run.mjs would do it.

[nicobytes]

Corrected in 78980a7 — you are right that the comment taught a mechanism that is not there, and the concrete consequence you name (someone adding <successCode>143</successCode> to allow timeouts and finding it does nothing) is exactly the kind of thing a wrong comment causes. It now says the watchdog throws directly and never consults successCodes.

The grandchild question I have not resolved, and I would rather say so than hand-wave it. You are right that commons-exec destroys pnpm, not the node process pnpm exec spawns, and that a surviving grandchild holding the stdout pipe could block PumpStreamHandler.stop(). I have not exercised it either.

It matters for the reason you give: boundedness is the entire justification for the parameter, and I have been describing it as a hard wall. Until it is tested it is a soft one.

Adding an internal deadline inside run.mjs would settle it, but that is harness decision logic again. Cheaper interim option, if you think it is worth it: invoke node directly rather than through pnpm exec, so there is no grandchild — the PATH already has the installed Node prepended, which is what the pnpm exec indirection was buying. Happy to do that here if you agree it is equivalent; otherwise it goes in the follow-up with the deadline.

[oidacra]

Worth one more sentence here about the branches this doesn't cover.

cicd_5-lts.yml triggers on push: branches: [release-*] and calls the test phase with the frontend filter (line 92), so the Frontend Unit Tests job does run with -Pvalidate on LTS branches — the gate is skipped there only because the event is push.

That's the right outcome (diffing an LTS branch against origin/main would be meaningless, and git.origin.branch is hardcoded to origin/main), but it looks accidental rather than designed. Would you note it, so nobody later "fixes the coverage gap" by adding a push profile and quietly starts diffing release branches against main?

For completeness: PRs targeting LTS branches never reach this workflow at all, since cicd_1-pr.yml:26-29 restricts to branches: [main, master].

[nicobytes]

Added in 78980a7, folded into the same paragraph as your trunk/nightly point since it is the same trap.

I verified the trigger: cicd_5-lts.yml does run the frontend suite with -Pvalidate on release-* pushes, and the gate is quiet there only because the event is push.

You are right that the outcome is correct but looks accidental. The comment now names LTS explicitly in the list of things that would break if someone "fixed the coverage gap" by adding a push profile — diffing a release branch against origin/main being the specific nonsense that would result.

The note that PRs targeting LTS branches never reach this workflow is useful context I did not have; thank you.

[oidacra]

Small readability point: unmappedNote(report) is invoked twice on each branch — once as the predicate, once as the value — and the same shape repeats at line 183. Would hoisting it once above the if (report.exitCode === 0) read better?

const note = unmappedNote(report);
// ...
...(note ? ['', note] : [])

It's pure and cheap so there's no correctness or performance consequence.

Separately, on line 166 just above: the pre-existing sentence already ends with "across N project config(s)", and costLine now repeats that verbatim two lines later, so the pass summary reads:

No new strict-mode violations. 0 pre-existing or dependency diagnostic(s) ignored, across 1 project config(s).

_Checked 1 changed file(s) across 1 project config(s) in 12.4s._

Would dropping the config count from the first sentence and letting costLine own it be cleaner? The cost line carries the file count too, so it's the more informative of the two.

[nicobytes]

Both taken in 78980a7.

unmappedNote is hoisted to a single const note above the branch, exactly as you wrote it. You are right there is no correctness consequence — it just reads as though the call might be expensive or non-deterministic, which it is not.

The duplicated "across N project config(s)" is a better catch than it looks. I dropped it from the pre-existing sentence and let the cost line own it, on your reasoning: the cost line carries the file count too, so it is the more informative of the two. The pass summary now reads:

No new strict-mode violations. 0 pre-existing or dependency diagnostic(s) ignored.

_1 changed file(s) across 1 project config(s), 12.4s._

That is a change to a line that predates this PR, so flagging it rather than burying it.

[nicobytes]

Both of the things I owed you are moving.

Probe: #37564 — draft, DO NOT MERGE. Carries this branch plus one deliberate TS7006 at core-web/libs/utils/src/lib/dot-utils.ts:270. It should come back red, with the merge-base warning absent, one annotation on the added line, and the check failing on exit 1. A green run there would mean the gate does not block, which is the defect this issue exists to fix. I will post the three confirmations on #37536 and close it.

Scope recorded on #37536 — #37536 (comment). It states plainly that the blocking flip was a direct decision during implementation and was not re-approved against the issue's stated scope, lists all four deviations from the acceptance list, and carries the merge-base finding including the part I think matters most for anyone reading the original evidence: the "0 false positives" figure was measured with a correct merge base and does not transfer to the configuration the gate was about to ship in. That framing is yours.

Deliberately not in this pull request, tracked for a follow-up, each answered on its own thread: exiting 2 on a base-tip fallback, a ::warning for changed files no project claims, and an internal deadline in run.mjs for the watchdog-grandchild question. All three cross the harness's decision logic, which is the one boundary this change has held. Say so if you would rather any of them block here.

Thank you for the mutation testing — four of my assertions were passing for the wrong reason and one could never have failed at all. That is not something I would have found by rereading.

[nicobytes]

Probe evidence is in: #37536 (comment) (see the following comment). All three confirmed — base from the event payload, annotation anchored to dot-utils.ts:270 at failure level, and BUILD FAILURE on exit 1 with the job concluding failure.

#37564 closed and its branch deleted.

One thing the probe turned up that I would not have predicted: the base-tip warning still fires, and now fires on every run, because both sides remain shallow so merge-base can never traverse. The behaviour is right — the base is the divergence point — but the message still reads "Findings may include changes the base introduced", which is now false. An always-present warning that says something untrue is the kind of thing people learn to skip, which is a small version of the failure this issue is about. Added to the follow-up next to the exit-2 question, since the harness cannot presently distinguish a degraded fallback from a correct one.

From my side this is ready. Holding for your call on whether any of the three follow-ups should block here.