test(tide): pin the merge_queue:off no-GraphQL rule, the draft-without-field refusal, and the fork-403 path boundaries

[hivecommons-hive]

Test Improvement

Pins six behaviours of src/plugins/tide.ts that a 50-mutant single-site probe showed no test asserts (each mutant passed the full npx vitest related src/plugins/tide.ts --run set, 60 files / 1166 tests, on a clean main@88241f4). Test-only; src/ and dist/ are untouched.

__tests__/plugins/tideMergeQueue.test.ts

• Both merge_queue: off tests assumed an unhandled /graphql request would fail them. It does not: queueState swallows the failed read with one core.warning and falls back to a direct merge, so "always call queueState" survived. They now serve /graphql with the call counter and assert calls is empty (and, in the 405 case, that no warning fired).
• New: a pr without a draft field whose mergeable_state is draft is refused, not enqueued — the only path to queueRefusedStates' 'draft' entry, since blockedReason catches draft: true first and getPull defaults a missing field to false.

__tests__/plugins/tide.test.ts

• New: does not wait for an unknown state on a draft pr — one GET, no sleep; pins blockedReason's draft check as distinct from the later mergeable_state check.
• New in the fork-403 describe: exactly five workflow files are all listed, with no "and 0 more" (fileList's > 5), and only paths under the top-level .github/workflows/ count — docs/.github/workflows/… and templates/.github/workflows/… (which this repository ships) are not workflow files (startsWith, not includes).
• New in getPull: a head whose repository is gone (head.repo: null) is not a fork.

After this change all six mutants are killed (re-run of the same probe against the direct tide test files). The two remaining survivors — state === 'open' → !== 'closed' in getPull and tideOnComment — only differ for a state GitHub never emits and are deliberately not tested.

Verification: npx vitest run __tests__/plugins/tide.test.ts __tests__/plugins/tideMergeQueue.test.ts — 141 passed; npx eslint on both files clean.

Occupied ground: __tests__/plugins/tide.test.ts (getPull, tryMergePullRequest state cases, fork-403 describe) and __tests__/plugins/tideMergeQueue.test.ts (draft and merge_queue: off cases). Disjoint from #510, #511, #512, #514, #516.

Related Issue

Closes #517

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Filed by quality agent (hold-gated mode). Human review required.

— hive: agent=quality backend=copilot model=claude-fable-5.1 copilot=1.0.88

[hivecommons-hive]

Important

Held for human review by the hive's ACMM level gate.

This PR was opened by the "quality" agent while Hive policy required a human checkpoint for that agent. Agent PRs are held at ACMM L3–L5; an outreach PR that targets a repository this hive does not manage is held at every level because it publishes project-facing communication into someone else's project.

Hive will keep the hold label until a human removes it. Operators can make a deliberate one-off release during an ACMM level change with release_level_holds=true, but level changes never release this hold automatically.

[github-actions]

Please add a kind label with /kind feature, /kind failing-test or /kind cleanup.