fix(ci): rescue daily-regen from GitHub's silently dropped cron ticks

[MarkusNeusinger]

Summary

• Diagnosis: GitHub's scheduler has been silently dropping daily-regen.yml's cron ticks in multi-day streaks since early June (full 10×/day cadence until Jun 3, then gaps of 4–13 days: Jun 3→8, Jun 8→20, Jul 1→14, Jul 14→20; only 5 scheduled runs in the last 13 days instead of ~130). Less-frequent crons in the same repo (watchdog-stuck-jobs every 6 h, bot-serving-check daily) kept firing throughout, and every daily-regen run that did start was green — so the workflow itself is healthy and nothing alarmed. All scheduled runs here start with a ~2–3.5 h scheduler delay, and GitHub documents top-of-hour overload as a cause for delayed/dropped schedule events; daily-regen is the repo's most frequent cron (2 h spacing ≈ the observed delay) and the only one affected.
• Fix 1: move the cron off the top of the hour (0 0,2,… → 17 0,2,…), the documented mitigation for the high-load window.
• Fix 2: watchdog-stuck-jobs.yml (which fires reliably) gains a cron-liveness section: if no daily-regen run of any trigger type has started for >10 h outside the 17–21 UTC Berlin-evening quiet window, it re-dispatches daily-regen.yml with default inputs via the existing DRY_RUN-aware dispatch helper — capping any future starvation at roughly half a day instead of two weeks.
• Also adds the previously missing watchdog-stuck-jobs.yml row to the workflow table in docs/workflows/overview.md.

Test plan

• YAML parses (yaml.safe_load) for both edited workflows
• Extracted watchdog run: script passes bash -n
• Threshold sanity-checked against the schedule: max legitimate gap between ticks is 6 h (16:xx → 22:xx UTC quiet window) plus observed ≤2–3.5 h scheduler delay, so >10 h silence is unambiguous starvation; rescue is skipped 17–21 UTC so a dispatched bulk-generate never starts in the Berlin evening
• Observable only on real scheduled runs (known verification gap for .github/workflows/ changes): after merge, confirm ticks land at :17 and that the next watchdog runs log the liveness line

Checklist

• CHANGELOG.md updated under [Unreleased] (Keep-a-Changelog categories,
  bold-titled bullets, PR ref) — required for every non-pipeline PR
• Related documentation updated (e.g. docs/reference/, docs/workflows/,
  docs/contributing.md) if behavior changed

🤖 Generated with Claude Code

https://claude.ai/code/session_014vs46U1fqUJQcpf2jE3YdN

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Generated by Claude Code

[Copilot]

Pull request overview

This PR improves the reliability of the repository’s scheduled “daily regen” maintenance by moving the daily-regen.yml cron away from GitHub’s top-of-hour overload window and adding a watchdog-based liveness rescue to re-dispatch the workflow if it appears starved.

Changes:

• Shift daily-regen.yml scheduled ticks from :00 to :17 on even UTC hours to reduce missed schedule events.
• Extend watchdog-stuck-jobs.yml to detect prolonged absence of daily-regen runs and re-dispatch it outside the quiet window.
• Document the updated scheduling behavior and watchdog responsibilities, and add a matching CHANGELOG.md entry.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
docs/workflows/overview.md	Updates the workflow overview table to include watchdog-stuck-jobs.yml and clarifies the daily-regen.yml cadence/minute offset.
CHANGELOG.md	Adds an [Unreleased] fix entry describing the cron starvation mitigation and watchdog rescue.
.github/workflows/watchdog-stuck-jobs.yml	Adds a “cron-liveness” section to re-dispatch daily-regen.yml after >10h without a run outside the quiet window.
.github/workflows/daily-regen.yml	Moves the cron schedule off the top of the hour (to minute 17) and documents the rationale and watchdog rescue behavior.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (3)

.github/workflows/impl-generate.yml:425

• The workflow is pinned to a temporary claude-code-action SHA with a "revert after" note. This kind of validation-only pin is easy to forget and can silently change behavior vs the previously vetted pin; if this PR’s scope is daily-regen/watchdog reliability, this should be reverted to the prior pin (or moved to a dedicated validation PR).

        uses: anthropics/claude-code-action@11ba60486e4aec9ddfeafcf4bb3f00b028ac2c16  # v1 (VALIDATION: July-1 pin, revert after)

.github/workflows/impl-generate.yml:466

• This validation step is unconditional (if: always()) and exits 1, which will force every impl-generate run to fail and stop the pipeline before PR/GCS/issue-comment side effects. If this PR is intended to ship, this needs to be removed or at least disabled/guarded so normal runs can complete.

      - name: TEST — inspect Claude output and stop (validation run)
        if: always()

.github/workflows/impl-generate.yml:1046

• Handle generation failure is fully disabled (if: false), which removes the workflow’s normal failure reporting/auto-retry behavior. If the validation block above is being removed/disabled, this should be restored so failures still get tracked and capped retries behave as designed.

      - name: Handle generation failure
        if: false  # VALIDATION: disabled during test so it can't comment/retry on #1010

[Copilot]

Pull request overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (3)

.github/workflows/impl-generate.yml:456

• Same as the primary Claude step: leaving show_full_output: true enabled in the retry path will also increase verbosity for normal runs after merge. Revert to the default (or gate behind an opt-in) so production logs stay stable.

        uses: anthropics/claude-code-action@1298632ce7736903d02a1435002705aa2a594a6c  # v1
        with:
          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
          # VALIDATION (diagnostic only, revert after): un-hide Claude's output so
          # the logs reveal exactly which tool calls are being permission-denied.
          show_full_output: true
          claude_args: "--model ${{ steps.inputs.outputs.model }}"
          # bulk-generate dispatches us from the github-actions bot; explicitly allow it.
          allowed_bots: '*'

.github/workflows/impl-generate.yml:473

• This validation step is unconditional (if: always()) and ends with exit 1, which will make every impl-generate run fail and prevents all downstream steps (metadata/PR/review) from executing. This will effectively disable the implementation pipeline if merged.

      - name: TEST — inspect Claude output and stop (validation run)
        if: always()
        env:

.github/workflows/impl-generate.yml:1052

• Failure handling is disabled via if: false, so generation failures would stop being tracked/commented and auto-retries would no longer occur. If the validation-only changes are removed/disabled, this condition should be restored so normal failure handling continues to work.

      - name: Handle generation failure
        if: false  # VALIDATION: disabled during test so it can't comment/retry on #1010

[MarkusNeusinger]

Coordination note (from the local session): root cause found & fixed elsewhere — no more validation runs on this branch.

To any watcher of this PR (including the parallel Claude session that pushed e2d81a2):

1. The July-23 validation run (30043934965) did not refute the action-version hypothesis — it never ran Claude at all. The action's OAuth token exchange rejects any run whose workflow file differs from main (401: Workflow validation failed. The workflow file must exist and have identical content to the version on the repository's default branch.). The same applies to the show_full_output diagnostic commit — any modified impl-generate.yml on a branch 401s before Claude starts. Branch-side validation is structurally impossible.
2. The real root cause is confirmed by local reproduction: since the July 5 action bump (CLI 2.1.170 → 2.1.211), Claude Code ignores permissions.allow from .claude/settings.json in untrusted workspaces (Ignoring 7 permissions.allow entries … this workspace has not been trusted), and a CI checkout is never trusted → every Write/Edit/Bash denied → 18–20 denials, zero files, repo-wide since July 1.
3. The fix is PR fix(workflows): restore CI Claude permissions broken by claude-code-action bump (pipeline generated nothing since July 5) #9651: pass --settings ${{ github.workspace }}/.claude/settings.json in claude_args on all 12 action steps (explicit --settings is honored by the trust gate — locally verified: denial without the flag, file written + 0 denials with it).
4. This branch has been cleaned: 5bf1678ae reverts all temporary validation changes; impl-generate.yml is byte-identical to main again. This PR is back to its original cron-offset + watchdog-liveness scope.

Please do not push further diagnostic commits or dispatch further validation runs here. Post-merge confirmation of #9651 will be a single real impl-generate dispatch on main.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.