fix(queue): re-gate every PR linked to changed issue

[JSONbored]

Motivation

• Issue-side label/assignment changes can flip deterministic linked-issue hard rules and must promptly re-evaluate all linked PRs to avoid stale passing gate state that could permit an ineligible contributor PR to merge.
• The previous implementation capped the immediate wake at SWEEP_MAX_PRS, leaving a tail of linked PRs un-re-gated until a later staleness sweep and creating a security-relevant race window.

Description

• Remove the slice(0, SWEEP_MAX_PRS) cap in maybeReReviewOnLinkedIssueChange so every open PR that links the changed issue is enqueued for a staggered agent-regate-pr job (preserves the per-PR delay staggering behavior).
• Update the doc comment above the function to reflect that every linked PR is woken promptly (still coalesced per-PR where appropriate).
• Update the regression test in test/unit/queue.test.ts to seed more than SWEEP_MAX_PRS linked PRs and assert that all linked PRs are enqueued with the expected staggered delaySeconds values.

Testing

• Ran the focused unit test: npx vitest run test/unit/queue.test.ts -t "issue-side linked PR wake re-gates every linked PR", and the targeted test passed.
• Ran type checking with npm run typecheck, which succeeded.
• Ran the full coverage job npm run test:coverage; the run produced coverage output but failed the repository global coverage thresholds (this is a global-suite result, not a regression of the focused change).
• git diff --check was validated locally (no diff-check errors reported).

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Codex Task

[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 93.30%. Comparing base (8398615) to head (509d6a5).
⚠️ Report is 6 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3787   +/-   ##
=======================================
  Coverage   93.30%   93.30%           
=======================================
  Files         317      317           
  Lines       32384    32384           
  Branches    11876    11876           
=======================================
  Hits        30215    30215           
  Misses       1537     1537           
  Partials      632      632           

Files with missing lines	Coverage Δ
src/queue/processors.ts	94.12% <ø> (ø)

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