feat: expose workflow console api and RPC service with @effect/rpc

- Replace manual JSON-RPC protocol handling with @effect/rpc typed RPCs
- Add evidence capture layer (per-call Ref, response body buffering/reconstruction)
- Add service module with typed dispatch and layer composition via Layer.mergeAll
- Add Hono API with /api/health, /api/connect, /api/rpc routes
- Add browser DTO contracts, error mapping, body size limits
- Add 13 Hono route tests and 12 target-policy tests passing
- Delete old protocol.ts and protocol.test.ts (replaced by rpcs.ts/service.ts)

web/packages/rpc/package.json

@@ -14,6 +14,8 @@
     "typecheck": "tsc -p tsconfig.json --noEmit"
   },
   "dependencies": {
+    "@effect/platform": "0.96.2",
+    "@effect/rpc": "0.75.1",
     "effect": "3.21.4"
   },
   "devDependencies": {