feat(F-001): scaffold modular monolith skeleton with boundary checker

- TypeScript + Fastify skeleton under project/ (src/modules, shared, infrastructure, app)
- scripts/check-module-boundaries.mjs enforcing module public-API rules (tested with fixtures)
- GET /health endpoint, error envelope without stack leakage
- specs/F-001-scaffold (SPEC/DESIGN/TASKS/TESTS), spec/tech.md dependency justification
- 30-ticket MercadoDeVida roadmap in backlog/features.json, spec/roadmap.md
- All gates approved: reviewer, security, qa; verify.sh green

work/artifacts/F-001/leader-close.json

@@ -0,0 +1,29 @@
+{
+  "feature_id": "F-001",
+  "agent": "leader",
+  "verdict": "APPROVED",
+  "summary": "F-001 closed. Scaffold modular monolith implemented in project/, all gates APPROVED, verify.sh exit 0.",
+  "gates": {
+    "reviewer": "APPROVED (reviewer.json)",
+    "security": "APPROVED (security.json)",
+    "qa": "APPROVED (qa.json)",
+    "verify_sh": "exit 0"
+  },
+  "deliverables": [
+    "project/: TypeScript + Fastify modular monolith skeleton (7 source files + toolchain)",
+    "boundary checker with tested fixtures enforcing module rules",
+    "specs/F-001-scaffold/ SPEC, DESIGN, TASKS, TESTS",
+    "spec/tech.md with dependency justification"
+  ],
+  "next_feature_hint": "F-002 (database foundation) - only depends on F-001",
+  "evidence": [
+    "work/artifacts/F-001/architect.md",
+    "work/artifacts/F-001/implementer.md",
+    "work/artifacts/F-001/reviewer.json",
+    "work/artifacts/F-001/security.json",
+    "work/artifacts/F-001/qa.json",
+    "work/artifacts/F-001/documenter.md",
+    "./scripts/verify.sh exit 0 at close"
+  ],
+  "timestamp": "2026-08-14T19:52:00Z"
+}