fix(ci-queue-watch): fail scheduled runs on a missing FLEET_READ_PAT

[claude]

Summary

The watchdog's "no token -> warn, exit 0" rule applied unconditionally, including on schedule. It has run 10 times, every run green, and observed nothing -- because FLEET_READ_PAT is unset and the token check takes its soft path regardless of trigger. It reported green twice today (07:20Z, 07:57Z) while the fleet was 40 hours into a total ARC outage: exactly the failure pattern this watchdog exists to detect, reproduced inside the detector.

The soft-path reasoning is correct on pull_request/workflow_dispatch (a fork PR or contributor without org secrets is an environmental gap, not an outage) but wrong on schedule, which has no legitimate transient reason to lack its token: either the secret is configured, or the tool is permanently inert.

token_gate() in scripts/ci_queue_watch.py now branches on the trigger:

• schedule + no token -> hard failure, ::error:: naming FLEET_READ_PAT, what it needs to be, and where to set it.
• pull_request / workflow_dispatch + no token -> unchanged: ::warning::, exit 0.

The decision moved out of embedded workflow bash into a new --token-gate CLI mode on the script (reads FLEET_READ_PAT/GITHUB_EVENT_NAME, writes ok= to $GITHUB_OUTPUT) so it's unit-testable the same way the rest of the script already is, instead of only exercised live by cron.

The other half, checked per the ask: with a token present and a pool genuinely STALLED, does a scheduled run already fail, or does it report-and-exit-0 too? Read main(): --fail-on-stall returns exit 1 on a stall, the Observe the fleet CI queue step pipes through tee under set -o pipefail (and the Actions default shell is already bash -eo pipefail), so the non-zero exit already propagates and fails the step/job. This path was already correct -- it just had zero test coverage, so I added an end-to-end test (fake GitHub API on a local HTTP server, real CLI invocation) to prove it rather than leave it assumed.

Tests

Both new test classes were mutation-verified per the ask -- restore the pre-fix behavior, confirm the new test (and only the new test) fails:

• Mutated token_gate() back to unconditional warn/exit-0 -> only test_scheduled_run_with_no_token_is_a_hard_failure failed; the sibling pull_request/workflow_dispatch tests, and all 19 other pre-existing tests, still passed.
• Mutated --fail-on-stall's return to always 0 -> only test_stalled_pool_with_token_present_fails failed; everything else, including the new token-gate tests, still passed.

python3 -m unittest discover -s scripts/__tests__ -p 'test_ci_queue_watch*.py' -> 21 passed with the fix in place (up from the prior 12).

Validation run

• actionlint .github/workflows/ci-queue-watch.yml -> clean (0 findings; a full-repo actionlint run does surface 65 pre-existing shellcheck warnings in unrelated workflow files, none touched by this PR).
• python3 -m py_compile scripts/ci_queue_watch.py -> OK.
• New action references: none added (workflow keeps its existing actions/checkout/actions/setup-python SHA pins; no new uses: introduced).

FuzeFront's own hosted runners work -- release.yml succeeded twice today (32623499635, 32623431741, both 2026-08-23 ~06:38Z) -- so this PR's checks can actually conclude, unlike much of the fleet during the outage this fix is about.

Test plan

• python3 -m unittest discover -s scripts/__tests__ -p 'test_ci_queue_watch*.py' -- 21/21 pass
• actionlint .github/workflows/ci-queue-watch.yml -- clean
• Mutation-verified both new test classes against their pre-fix behavior
• Live scheduled run on master post-merge (next */15 * * * * tick) -- not verifiable pre-merge

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_01GaPa3JgrVNtWrGvqQEAEqv

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[izzywdev]

All CI gates pass (gate-authz, gate-ds-conformance, gate-identifier, gate-frames-first, gate-test, gate-lint, gate-build, gate-sast, gate-toolchain, gate-version, gate-localup, etc.). Approving per governance policy.

[izzywdev]

Closing as superseded by #797 — owner decision.

Three PRs (#780, #797, #802) rewrite the same token-gate step in .github/workflows/ci-queue-watch.yml, in two incompatible designs. Both this one and #797 were approved, so whichever merged second would have conflicted with or partly reverted the first. The owner picked #797.

What this PR did well, recorded so it isn't lost:

• It moved the decision into scripts/ci_queue_watch.py as a unit-testable token_gate(), distinguishing schedule (hard fail) from pull_request / workflow_dispatch (warn, exit 0).
• That is genuinely more robust if the job's trigger set ever widens.

Why #797 was chosen over it:

• fix(ci-queue-watch): a blind watchdog must be RED, not green #797's reasoning answers this PR's central premise directly: the watch job's if: already excludes pull_request, and workflow_dispatch requires write access — so on the triggers that can actually reach this step, a missing token is always misconfiguration, and the trigger-distinction has no case to serve.
• More importantly, this PR keeps if: steps.tok.outputs.ok == 'true' on the observe step. That gate is the bypass that let the watchdog skip silently and report green through a 40-hour outage. fix(ci-queue-watch): a blind watchdog must be RED, not green #797 deletes it, so the step cannot be gated out at all.

The residual risk in #797 is noted: if that job's if: is ever loosened to include fork PRs, its unconditional exit 1 would red them. If that change is ever made, this PR's token_gate() is the design to come back to.

No work is lost — the defect is fixed by #797.

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