feat(F-003): HTTP foundation with request context and error envelope

- request_id generated or sanitized-propagated on every request (x-request-id)
- structured JSON logging (pino), one correlated line per request, injectable logger
- error envelope v2 { error: { statusCode, code, message, details? }, requestId }
- 5xx messages always generic; stack traces stay in server logs only
- explicit parseJson (zod) input validation hook at the API layer
- README HTTP contract section; deps justified in spec/tech.md
- all gates approved; verify.sh green

project/package-lock.json

@@ -10,7 +10,9 @@
       "dependencies": {
         "fastify": "^5.2.0",
         "node-pg-migrate": "^9.0.0",
-        "pg": "^8.23.0"
+        "pg": "^8.23.0",
+        "pino": "^10.3.1",
+        "zod": "^4.4.3"
       },
       "devDependencies": {
         "@eslint/js": "^9.17.0",
@@ -4176,6 +4178,15 @@
       "funding": {
         "url": "https://github.com/sponsors/sindresorhus"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
+      "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }