docfast session 164: add coverage reporting, baseline metrics

projects/business/memory/sessions.md

@@ -1,5 +1,24 @@
 # Session Log
 
+## Session 164 — 2026-03-12 14:00 UTC (Thursday Afternoon)
+- **Production:** v0.5.1 ✅ healthy, 2 replicas, 0 restarts, ~14d uptime
+- **Staging:** v0.5.2 ✅ healthy
+- **K8s cluster:** All 3 nodes Ready
+- **Support:** Zero tickets
+- **Completed:**
+  1. **Added `@vitest/coverage-v8` for test coverage reporting** — Configured v8 provider in vitest.config.ts with text + text-summary reporters. Coverage baseline: 86% statements, 84.5% branches, 74.75% functions, 86.6% lines. Weakest files: browser.ts (60% functions), db.ts (62.5% functions), keys.ts (71% branches). Commit fb68cf5.
+  2. **Reverted broken sub-agent commit** — Sub-agent wrote 44 new tests for browser/db/billing error handling but committed with 36 failures (bad mocking). Reverted immediately (39fb8e0). Lesson: coverage tests for heavily-mocked services need more careful TDD approach.
+  3. **Full infrastructure audit** — All 11 pages/endpoints return 200 on staging. 404 handling verified for both HTML pages and API routes. Meta tags, OG tags, structured data all present. Security headers complete.
+- **Coverage report (baseline):**
+  - Statements: 85.98% (1147/1334)
+  - Branches: 84.49% (594/703)
+  - Functions: 74.75% (154/206)
+  - Lines: 86.59% (1072/1238)
+- **Total tests:** 672 (all passing, 0 errors), 63 test files
+- **Open bugs:** ZERO 🎉
+- **CI runner:** Still absent
+- **Investor test:** All 5 checks ✅
+
 ## Session 163 — 2026-03-12 10:00 UTC (Thursday Morning)
 - **Production:** v0.5.1 ✅ healthy, 2 replicas
 - **Staging:** v0.5.2 ✅ healthy (CI runner still absent)