feat: explainable longitudinal pattern summaries with cited records (#34)

The home insight card now reports the confirmed-log count and form
groupings for a window, every line names the exact confirmed records it
was built from, and following a citation opens those records. A window
below the minimum states that it is too sparse instead of describing a
trend, and a window with both firm and loose logs says it is mixed rather
than picking a winner. No line explains a cause, rules on food, or offers
a health verdict.

- src/summary.js: window filtering, insufficient-data guard, per-form
  lines, mixed-pattern line, boundary copy, record citations
- app.js: explainable home card plus a pattern-source sheet listing the
  cited records
- tests/summary.test.js, tests/pattern-summary.acceptance.mjs: unit and
  real-browser coverage, gated in CI and the release builder
- scripts/record_release_demo.mjs: fictional multi-day sample logs,
  citation follow-through, and the sparse-window refusal on camera

.gitea/workflows/quality.yml

@@ -57,6 +57,7 @@ jobs:
           npm run test:followup
           npm run test:vision-refusal
           npm run test:worker-readiness
+          npm run test:pattern-summary
       - name: Dependency audit
         run: npm audit --audit-level=high
       - name: Syntax checks