[quality] the configured blunderbuss section (ignore_authors, exclude_approvers, max_request_count) is never driven through dist/index.js #290

Finding

docs/configuration.md documents five blunderbuss: options. The bundle suite (__tests__/bundle, the only place the shipped dist/index.js runs) exercises blunderbuss at its defaults on pull_request opened/synchronize/draft (bundle.test.ts:1010–1066) and request_count via /auto-cc (bundle.test.ts:1068–1086). The other three options never reach dist/:

• ignore_authors — src/plugins/blunderbuss.ts:35 (lowercasing) and 159–161 (the skip)
• exclude_approvers — the true arm of the candidate set at :171
• max_request_count — :185–189 (the cap and the "already has N requested reviewers" return)

Each changes the action's API traffic (whether and how many reviewers POST …/pulls/1/requested_reviewers carries), so they are behaviour of the shipped bundle, not lookup-table variations.

Evidence

• Unit: npx vitest run --coverage on main @ 3fc21f2 (Node v26.10.0, vitest 5.0.3, @vitest/coverage-v8 5.0.3): blunderbuss.ts 100 % lines / 100 % branches (__tests__/plugins/blunderbuss.test.ts).
• End-to-end: npm run test:coverage:e2e (test(coverage): add test:coverage:e2e to report the bundle suite's coverage of src/ #274) on the same revision, local run with --coverage.reporter=lcovonly: blunderbuss.ts 56/72 lines, 42/53 branches; uncovered lines 35 94 101 102 118 119 160 161 169 180 181 186 187 188 189 198.
• The two figures are stated separately: unit and e2e statement maps come from different transforms and do not line-merge ([quality] the bundle e2e suite's coverage of src/ is never captured — runBundle.ts drops NODE_V8_COVERAGE and dist/ has no source map #235).

Recommendation

• __tests__/bundle/blunderbussSettings.test.ts (new file): drive pull_request opened through dist/index.js against fakeGithub with an org prow.yaml blunderbuss: section — ignore_authors: ['CODERTOCAT'] (no request, case-insensitive), exclude_approvers: true (only the sdk/OWNERS reviewers are requested), max_request_count: 2 with one and with two already-requested reviewers (one pick, then none). Expected after: blunderbuss.ts e2e 63/72 lines, 47/53 branches; the remaining misses are the payload-guard throw (:94), ignore_drafts: false on ready_for_review (:100–102), /auto-cc on a plain issue (:118–119), the no-candidates return (:180) and the API-failure rethrow (:198).

Priority

• Impact: medium — unit-covered, not end-to-end-covered (priority 2 under the coverage evidence rules)
• Effort: low

Filed by quality agent (hold-gated mode)

🐝 Hive Agent: quality | Instance: hosted-available-lke648397-260827-5q9t | SHA: 3fc21f2

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