test(selfhost): cover jobCoalesceKey missing-field fallbacks for 6 job types

[jaytbarimbao-collab]

Fixes #5850.

jobCoalesceKey (src/selfhost/queue-common.ts) maps a job payload to a coalesce key. For several job types it fills a missing optional field with a literal fallback token (normalizedX(...) ?? "<fallback>") so the job still coalesces to a stable slot instead of null-ing (and duplicating). Those fallback arms had no direct coverage.

Test-only (no production change): adds one case asserting the exact fallback key when the optional fields are absent, for six job types:

• backfill-registered-repos → …:all:default:0
• backfill-repo-segment → …:unknown:unknown:default:0:start
• backfill-pr-details → …:unknown:default:start
• generate-review-recap → …:all
• refresh-contributor-activity → …:unknown:all
• rollup-product-usage → …:latest:default

All 85 tests in the file pass; typecheck clean.

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

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✅ LoopOver review result - approve/merge recommended

_{Review updated: 2026-07-14 20:23:33 UTC}

1 file · 1 AI reviewer · no blockers · readiness 100/100 · CI green · clean

✅ Suggested Action - Approve/Merge

• safe to merge

Review summary
This is a test-only addition that adds one test case covering the missing-field fallback token for six job types in jobCoalesceKey, verified against the actual switch-statement logic in queue-common.ts. Each expected key string was traced against the corresponding case (repo??fallback, mode??fallback, cursor??fallback, boolFlag(undefined)==='0') and all six assertions match the real fallback chain exactly, with no production code changed. This closes the coverage gap named in issue #5850.

Nits — 2 non-blocking

• The single test bundles six unrelated job types into one `it` block; a failure in one assertion aborts the rest, so splitting into per-type cases (or `it.each`) would give clearer failure isolation.
• test/unit/selfhost-queue-common.test.ts:932 — consider `it.each` over the six job types to get independent pass/fail reporting per type.

Signal	Result	Evidence
Code review	✅ No blockers	1 reviewer
Linked issue	✅ Linked	#5850
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Change scope	✅ 20/20	Low review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 75 registered-repo PR(s), 36 merged, 4 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	jaytbarimbao-collab; Gittensor profile; 75 PR(s), 4 issue(s).
Gate result	✅ Passing	No configured blocker found.
Improvement	⚠️ ℹ️ Insufficient signal	risk: clean · value: insufficient-signal — Nothing measurable for the structural-improvement analyzers on this PR (e.g. no code files changed). LLM value judgment: minor — A narrow, correct test-only patch that closes a specific coverage gap tied to issue #5850 without touching production logic.

Linked issue satisfaction

Partially addressed
The PR adds a single consolidated test asserting missing-field fallback keys for backfill-repo-segment, backfill-pr-details, generate-review-recap, refresh-contributor-activity, and rollup-product-usage, but omits generate-weekly-value-report entirely and does not cover generate-signal-snapshots/build-burden-forecasts as alternates, nor does it test the backfill-pr-details happy path or the separa

Review context

• Author: jaytbarimbao-collab
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: not available
• Official Gittensor activity: 75 PR(s), 4 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Keep the PR focused and include validation evidence before maintainer review.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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Gittensory approves — the gate is satisfied and CI is green.