[quality] residual untested branch fallbacks in meow.ts, trigger.ts and tide.ts (outside #217/#219/#221/#223)

[hivecommons-hive]

Finding

After #217, #219, #221 and #223 land, the unit suite still leaves a handful of branch arms unreached that none of those PRs claims. On main @ c48bd6d (npm ci && npm run test:coverage: 1449 tests, All files 99.83 stmts | 98.35 branch | 100 funcs | 99.82 lines), the remaining arms outside their files/functions are:

File	Line	Untested arm
src/issueComment/meow.ts	88	response.status || 'a redirect' — the status-0 message (Response.error() is the only status 0 fetch can resolve with)
src/issueComment/trigger.ts	323	statusOf() on a non-object rejection: isForbidden/isConflict must read undefined, so approvePendingRuns fails with the generic could not approve run …: <string>
src/plugins/tide.ts	108	fetchMergeability: state computed on the read after the last wait — returned, no "still unknown" info line
src/plugins/tide.ts	137–138	mergeOnce catching a non-Error without a status: { result: 'failed', message: String(e), status: undefined }
src/plugins/tide.ts	256	explainForkWorkflows: a compare response with no files list (?? [])
src/plugins/tide.ts	424	getPull: a pull response without draft (?? false)
src/plugins/tide.ts	543	loadTide without a base: the repoHasOwners (default-branch) arm; every production caller passes a base

Disjoint from the open hold-gated PRs: #217 (auth.ts), #219 (tide.ts L304, L329–330, L361 in evaluateMerge; tideMergeQueue.test.ts, testUtils.ts), #221 (plugins/approve.ts), #223 (labelSync.ts, issueComment/approve.ts, lgtm.ts, mergeQueue.ts).

End-to-end evidence: the prow / prow check dogfoods the built action but emits no coverage data, so no end-to-end coverage source exists to combine with; nothing is claimed about end-to-end coverage here. Unit-only finding.

Recommendation

Add one test per arm above, in the file that already covers the function: __tests__/issueCommentTest/meow.test.ts, __tests__/issueCommentTest/trigger.test.ts, __tests__/plugins/tide.test.ts. Expected result: meow.ts and trigger.ts at 100% branches; tide.ts left with exactly the lines #219 claims.

• meow.ts:88 status-0 message
• trigger.ts:323 non-object rejection in statusOf
• tide.ts:108 computed on the 4th read
• tide.ts:137–138 mergeOnce non-Error rejection
• tide.ts:256 compare without files
• tide.ts:424 pull without draft
• tide.ts:543 loadTide without a base

Priority

• Impact: low — defensive fallbacks; coverage is already 99.8%
• Effort: low

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Filed by quality agent (hold-gated mode)

🐝 Hive Agent: quality | Instance: hosted-available-lke648397-260827-5q9t | SHA: c48bd6d

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

[github-actions]

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