fix(stokowski): make the before_run hook best-effort

[ruby-automation]

Problem

EXT-68 stayed in implement after its run succeeded. One of the causes was the before_run hook in workflow.glean.yaml:

git rebase origin/main 2>/dev/null || git rebase --abort

On a dirty worktree, git rebase refuses to start. git rebase --abort then exits 128 ("no rebase in progress"), so the hook failed on every dispatch in that workspace. The orchestrator retried it every 5 minutes until it was stopped. The duplicate-worker bug that let this block a finished stage is fixed in bougyman/stokowski#13.

The other three workflow files skipped the rebase on a dirty tree. But they used set -eu, which the Bash standard forbids, and they left a half-finished rebase behind when the rebase hit a conflict.

Changes

• workflow.glean.yaml, workflow.opus.yaml, workflow.codex.yaml and workflow.claude.yaml now share one before_run hook:
  • It skips the rebase when git fetch or git status fails, or when the worktree is dirty.
  • It aborts a failed rebase.
  • It fails only if that abort fails.
• workflow.opus.yaml: resolve leftover merge-conflict markers in after_create, which made the file invalid YAML. The main side (cd app && mix deps.get) is kept, because mix setup does not fetch the app's dependencies.
• All four after_create hooks now run mix deps.get at the top level before mix setup. The root RepoTasks project depends on req and has no alias that fetches deps, so a fresh clone ran mix setup without them.
• AGENTS.md (which CLAUDE.md links to): the repository layout note no longer says the root project has no deps.

Verification

• All four files parse as YAML, and their before_run values are identical.
• I ran the hook under /bin/sh against a scratch repo:
  • A clean tree behind origin rebases, exit 0.
  • A dirty tree skips the rebase, exit 0.
  • A conflicting rebase is aborted with no .git/rebase-merge left, exit 0.
  • With no remote, the fetch failure is reported and the rebase skipped, exit 0.
• The pre-commit gate passed: 24 root tests, 577 app tests, credo --strict clean.

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