fix(review): refresh PR files when pre-merge checks are path-gated

[JSONbored]

Motivation

• Path-scoped review.pre_merge_checks (entries with when_paths) rely on accurate PR file lists to decide whether an enforced check applies, and stale cached pull_request_files could let an enforced check be incorrectly ignored.

Description

• Add shouldRefreshFilesForPreMergeChecks(env, repoFullName) to detect whether the repo manifest contains any pre_merge_checks with when_paths.
• Wire that predicate into stored re-review, pull_request webhook synchronize/processing, and manual re-run paths so refreshPullRequestDetails runs when path-gated checks are configured.
• Add a unit test for the refresh predicate in test/unit/gate-check-policy.test.ts and a synchronize regression test that seeds stale cached files and verifies a live files fetch replaces them in test/unit/queue.test.ts.

Testing

• Ran git diff --check and npm run typecheck, both succeeded.
• Ran targeted unit tests with npx vitest run test/unit/gate-check-policy.test.ts test/unit/queue.test.ts -t "refreshes files when pre-merge checks|refreshes pull request files for path-gated pre-merge checks" and the new/affected tests passed.
• Attempted full npm run test:ci; the run progressed but could not be completed in this environment (coverage phase / long-running CI step was stopped).
• npm audit --audit-level=moderate could not complete due to the registry audit endpoint returning 403 Forbidden in this environment.

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Codex Task

[superagent-security]

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

[codecov]

Codecov Report

❌ Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.34%. Comparing base (6138b9e) to head (b455de9).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/queue/processors.ts	80.00%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (80.00%) is below the target coverage (97.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1402   +/-   ##
=======================================
  Coverage   95.33%   95.34%           
=======================================
  Files         192      192           
  Lines       20750    20752    +2     
  Branches     7500     7500           
=======================================
+ Hits        19783    19785    +2     
  Misses        383      383           
  Partials      584      584           

Files with missing lines	Coverage Δ
src/queue/processors.ts	87.63% <80.00%> (+0.02%)	⬆️

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