test(signals): fix drifted queue-health fixture dates (unblocks main CI)

[JSONbored]

Problem

test (2) + the validate aggregator are failing on main and on every open PR (#985, #996, #997). Root cause is a single time-bomb test:

test/unit/signals-v2.test.ts > v2 signal builders > adds queue age buckets and likely-reviewable counts
AssertionError: expected 0 to be greater than or equal to 1

The shared pullRequests fixture used fixed updatedAt dates. PR #10 (2026-05-23) was chosen to be "recent" but, as of 2026-06-22, it is exactly 30 days old — crossing the < 30 days likely-reviewable cutoff in buildQueueHealth, so likelyReviewablePullRequests dropped to 0.

Fix

Anchor the shared fixture's PR ages relative to now (isoDaysAgo(20) / isoDaysAgo(82)) so the age-bucket / reviewability windows never drift again. Test-only change; all 31 tests in the file pass.

This unblocks test (2) + validate for main and the three open PRs.

[ghost]

Note

Gittensory Gate skipped

PR closed before full evaluation. No late first comment was created.

Signal	Result	Evidence	Action
Gate result	⚠️ Skipped	#1003 is no longer open.	No action.

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[superagent-security]

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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.61%. Comparing base (363c0fb) to head (282f97a).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1003   +/-   ##
=======================================
  Coverage   96.61%   96.61%           
=======================================
  Files         110      110           
  Lines       15079    15079           
  Branches     5451     5451           
=======================================
  Hits        14569    14569           
  Misses        106      106           
  Partials      404      404           

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