[marcusrbrown]

Closes out the pnpm → Bun migration plan (docs/plans/2026-10-19-002-refactor-bun-migration-plan.md). This PR changes only the plan document. No code or guidance changes.

Changes

• Plan status is now completed, and all seven units are checked off.
• The plan's deferred questions are replaced with their outcomes:
  • RE2: bun run install fetches re2's prebuilt binary, but that binary is built for Node's ABI (NODE_MODULE_VERSION 137). Bun 1.4.3 requires 147, so RE2 loads only under Node and check:renovate-config stays on Node.
  • Vitest: under bun --bun vitest run, the full suite matches Node on every file and test name (5648 passed, 43 skipped, 3 todo), and so does the release real-plugin suite (105). The three Renovate real-plugin suites fail 13 of 102 tests on Bun because of the same RE2 ABI mismatch. Vitest stays on Node.
  • Stryker: under bunx --bun stryker run, Stryker instruments all 2,733 mutants but runs none, because it cannot load @stryker-mutator/vitest-runner. The cause is Vite 8.0.16 calling Error.captureStackTrace on an object that is not an Error; Node accepts that call and Bun 1.4.3 rejects it. Stryker stays on Node, where the baseline is clean.
  • Review Dependencies, Renovate postUpgradeTasks, the Bun script shell and the dropped ts-declaration-location entry: all confirmed working.
• The plan now records when to re-test Vitest and Stryker on Bun: a Bun release that loads re2's prebuilt binding, and a Bun or Vite release that accepts the Error.captureStackTrace call.

The guidance already lists Vitest and Stryker as Node exceptions.

[fro-bot]

Verdict: PASS

The recorded Node exceptions match the package scripts, CI commands, and mutation runner. Retaining Node after failed parity checks follows the plan's acceptance criteria.

Blocking issues

None

Non-blocking concerns

None

Missing tests

None. This PR changes only the migration record; it introduces no executable behavior requiring new tests. Historical runtime counts were not independently reproduced.

Risk assessment (LOW) + rationale

Documentation-only closure; no changes to dependencies, permissions, workflows, or runtime selection.

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Run Summary

Field	Value
Event	pull_request
Repository	fro-bot/.github
Run ID	39470124773
Cache	hit
Session	ses_ea58befc0ffeZTxM46gCPWrueJ
Verification	Reviewed the complete PR diff and runtime configuration; git diff --check passed. Test suites were not rerun.
Review coverage	Manual review; structured review helper references were unavailable due to filesystem access restrictions.