Captures the brainstorm convergence (2026-05-13) into a draft PRD that
seeds the implementation epic. Decisions captured:
- 4-layer coverage architecture (L0 vitest thresholds, L1 diff coverage,
L2 aggregate summary.json, L3 mutation testing on entities + use-cases)
- Manifest-driven coverage band as the single source of truth — vitest
config, assertFeatureConformance boot check, and pnpm coverage:diff
all derive expectations from feature.manifest.ts
- Cover-the-diff (every changed line exercised) not cover-the-new-code
- Aggregate trend committed as coverage/summary.json; no SaaS dep
- Stryker for mutation, on-demand only, NOT in default pnpm test
L0 verification findings (also captured in the PRD):
- auth / blog / marketing-pages: green (100% layer bands hold)
- navigation: real test gaps in entities + controllers (~86%)
- media: missing @vitest/coverage-v8 dep + vitest.config has no
coverage block at all (entirely absent — the most extreme case of
the duplication problem the manifest-driven keystone eliminates)
Status remains draft until the human review pass. Decomposer will
refuse to run on draft.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Danijel Martinek
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