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scripts/ci-test-scope.cjs's classify() previously set full_matrix=true for ANY changed tests/**/*.test.cjs file, unconditionally (restored by #4421 after #962's narrowing let a real macOS-only regression, PR #4384, land undetected). This replaces that blanket rule with a reachability check against real data instead of a path prefix: - A changed test file forces full_matrix only when it is present in Phase 2's committed CONFORMANCE_TIER_FILES list (scripts/lib/platform- conformance-tier.generated.cjs) -- direct membership, not a graph walk. - A changed src/ file forces full_matrix when its own content carries a genuine platform-conditional signal, reusing gen-platform-conformance- tier.cjs's classifyContent with a narrowed, source-code-safe signal subset (excludes two categories -- hardcoded-path-vs-path-call and symlink-keyword -- empirically found to flag 100/235 src/ files when applied verbatim, versus 28/235 with the narrow subset, all verified to carry genuine platform branches). New export: NOISY_FOR_SOURCE_REACHABILITY. - A change to the classification mechanism's own definition files (gen-platform-conformance-tier.cjs, the generated tier list, or suite-detection.cjs) always forces full_matrix -- the mechanism being changed cannot presume its own new output is safe. - Any computation error (a require/read failure, a malformed module) fails safe to full_matrix=true, per the issue's explicit requirement. The existing RULES array entries with their own fullMatrix:true (workflow automation, installer/package layout, hooks, environment/dependency gates, test harness) are deliberately left untouched -- they are curated, narrowly-scoped triggers for "this diff changes the CI/installer/hooks mechanism itself," a different and still-valid reason than "product code might reach a platform branch." Disclosed in .gsd/phase/.../40-design.md as a scope decision, since the issue's "Done when" wording read broader than its "Proposed work" bullets. Two design assumptions were caught and corrected before any code was written (rubber-duck pass, documented in 40-design.md): (1) reusing Phase 2's classifyContent verbatim against src/ was far too noisy; (2) a single hardcoded seam file (src/shell-command-projection.cts only, per CLAUDE.md's "single platform seam" framing) would have silently missed genuine, independent platform branches in src/runtime-hooks-surface.cts, src/capability-lock.cts, src/capability-ledger.cts, and src/surface.cts -- reintroducing the #4421 failure shape inside src/ instead of tests/. An isolated code-review pass found and fixed one real defect (a dead, untested branch that would have survived Stryker mutation testing) and one design-doc completeness gap (2 of 8 "narrow" signal categories were left implicitly rather than explicitly audited). An isolated security-review pass found no qualifying findings. tests/ci-test-scope.test.cjs gains the full #4592 boundary-case matrix (.gsd/phase/.../50-test-matrix.md), including a named #4421 regression case proving tests/state-todos-render.test.cjs still forces full_matrix, now for the documented reason instead of the removed blanket rule. Two pre-existing tests were corrected: one used a nonexistent fixture path (src/semver.cts -> src/semver-compare.cts, a real file); one (A3) asserted the exact old blanket-rule behavior this issue removes, updated to the new, verified- correct expectation. Co-authored-by: sim <sim@local> Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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