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/src/index.ts

@@ -11,11 +11,20 @@ export {
 
 export { normalizeLoopbackTarget } from "./target-policy.js";
 
-export { decodeRpcResponse } from "./protocol.js";
+export { WorkflowHealth, WorkflowSourcesList, WorkflowRpcs } from "./rpcs.js";
 
-export type {
-  JsonRpcRequest,
-  JsonRpcResponse,
-  JsonRpcSuccess,
-  JsonRpcFailure,
-} from "./protocol.js";
+export { WorkflowRpc, makeWorkflowRpcLayer } from "./service.js";
+export type { OperationExchange, WorkflowRpcError, OperationName } from "./service.js";
+
+export {
+  getOperationMeta,
+  listOperations,
+} from "./method-registry.js";
+export type { OperationMeta } from "./method-registry.js";
+
+export {
+  EvidenceRef,
+  makeEvidenceLayer,
+  withEvidenceCapture,
+} from "./evidence.js";
+export type { EvidenceRecord } from "./evidence.js";