fix(rpc): close the service-collision fail-open and the fix-wave gaps

Critical:
- router: fail loudly (WRN-SERVICE-COLLISION) when two app/services files
  scan to the same service name, instead of silently letting directory-walk
  order pick a winner.

Important:
- server.ts: wrap a throwing input schema so its raw message cannot escape
  invoke(); returns RPC_INVALID and logs server-side instead.
- client.ts: race timeoutMs against transport.call so a stalled transport
  cannot hang the caller; rejects with a ServiceError(RPC_TRANSPORT).
- client.ts: the proxy returns undefined for undeclared properties (incl.
  then/catch/finally) instead of a function that throws, closing the
  await-client thenable trap.
- gateway.ts / rpc-dispatch.ts: import RPC_PATH_PREFIX / RPC_INTERNAL_HEADER
  from @wrnexus/rpc instead of hardcoding local copies.
- gateway.test.ts: cover the RPC-prefix edge block and internal-header
  stripping across casing variants.
- http.test.ts / client.test.ts: cover anonymous-call header omission, the
  internal marker, the retryable-status sweep, network/malformed/HTML
  failures, AbortSignal propagation, the timeout path, and timer cleanup.

Minor:
- transport.ts: Object.hasOwn for handler lookup; note the entry-only abort
  check.
- client.ts: wrap a missing/invalid WRNEXUS_RPC_SECRET as a ServiceError
  (RPC_IDENTITY) instead of a bare Error.
- rpc/package.json: drop the unused @wrnexus/authz dependency.
- server.ts: implement() now throws at construction time if a declared
  procedure has no own handler.

Verified: reverting the service-collision check and the client timeout race
each make their new test fail, then restore green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/rpc/src/client.ts

@@ -32,24 +32,53 @@ export function serviceClient<Procedures extends AnyProcedures>(
   const timeoutMs = options.timeoutMs ?? DEFAULT_TIMEOUT_MS;
   return new Proxy({} as ServiceClient<Procedures>, {
     get(_target, property) {
-      if (typeof property !== "string") return undefined;
+      // Every declared procedure is a string key; anything else (including
+      // `then`/`catch`/`finally`) is not one of ours. Returning a function for
+      // those makes `await client` or `return client` from an async function
+      // read the proxy as thenable — the runtime then calls `then(resolve,
+      // reject)`, which throws "Unknown procedure". Returning undefined lets
+      // the caller be treated as a plain (non-thenable) object instead.
+      if (typeof property !== "string" || !Object.hasOwn(contract.procedures, property)) {
+        return undefined;
+      }
       return async (input: unknown) => {
-        if (!Object.hasOwn(contract.procedures, property)) {
-          throw new ServiceError(RPC_ERROR_CODES.unknown, "Unknown procedure");
+        let identity: string | undefined;
+        if (options.as) {
+          try {
+            identity = await exportSubjectContext(options.as, app);
+          } catch (error) {
+            // A missing/misconfigured WRNEXUS_RPC_SECRET otherwise rejects with
+            // a bare Error, so a caller matching on ServiceError treats
+            // misconfiguration as a crash instead of a handled RPC failure.
+            // The operator-facing message names no secret value, so it is safe
+            // to preserve.
+            const message = error instanceof Error ? error.message : String(error);
+            throw new ServiceError(RPC_ERROR_CODES.identity, message);
+          }
         }
-        const identity = options.as ? await exportSubjectContext(options.as, app) : undefined;
         const controller = new AbortController();
         const timer = setTimeout(() => controller.abort(), timeoutMs);
+        const timeout = new Promise<never>((_, reject) => {
+          controller.signal.addEventListener("abort", () => {
+            reject(new ServiceError(RPC_ERROR_CODES.transport, "Call timed out"));
+          });
+        });
+        const callPromise = options.transport.call(
+          { app, service: contract.name, procedure: property },
+          input,
+          { signal: controller.signal, ...(identity ? { identity } : {}) },
+        );
         try {
-          const result = await options.transport.call(
-            { app, service: contract.name, procedure: property },
-            input,
-            { signal: controller.signal, ...(identity ? { identity } : {}) },
-          );
+          const result = await Promise.race([callPromise, timeout]);
           if (result.ok) return result.value;
           throw new ServiceError(result.code, result.message);
         } finally {
           clearTimeout(timer);
+          // If the timeout won the race, the transport call may still settle
+          // later — a transport that ignores the abort signal keeps running.
+          // Nothing awaits it again, so swallow a late rejection here rather
+          // than let it surface as an unhandled promise rejection.
+          callPromise.catch(() => {});
         }
       };
     },

packages/rpc/src/server.ts

@@ -34,6 +34,16 @@ export function implement<Procedures extends AnyProcedures>(
   handlers: ServiceHandlers<Procedures>,
   options: ImplementOptions,
 ): ServiceImplementation<Procedures> {
+  // A declared procedure with no own handler would otherwise only surface at
+  // invoke time as RPC_UNKNOWN — a silent, permanent 404. Catch it now.
+  for (const procedureName of Object.keys(contract.procedures)) {
+    if (!Object.hasOwn(handlers, procedureName)) {
+      throw new Error(
+        `WRN-RPC-HANDLER: service "${contract.name}" declares procedure "${procedureName}" ` +
+          `but implement() was not given a handler for it.`,
+      );
+    }
+  }
   return {
     contract,
     async invoke(procedureName, payload, identity) {
@@ -69,7 +79,17 @@ export function implement<Procedures extends AnyProcedures>(
 
       let input: unknown = payload;
       if (definition.input) {
-        const parsed = definition.input.parse(payload as Record<string, unknown>);
+        // InputSchema is structural: any custom or wrapped schema may throw
+        // instead of returning { ok: false }. A throw must not escape invoke()
+        // with its raw message — that text can carry internals — so it is
+        // caught the same way the permission check above is.
+        let parsed: { ok: boolean; value?: unknown };
+        try {
+          parsed = definition.input.parse(payload as Record<string, unknown>);
+        } catch (error) {
+          console.error(`[wrnexus] RPC input schema threw for ${String(procedureName)}`, error);
+          return failure(RPC_ERROR_CODES.invalid, "Invalid input");
+        }
         if (!parsed.ok) return failure(RPC_ERROR_CODES.invalid, "Invalid input");
         input = parsed.value;
       }

packages/rpc/src/transport.ts

@@ -25,8 +25,16 @@ export type InProcessHandler = (
 export function inProcessTransport(handlers: Record<string, InProcessHandler>): Transport {
   return {
     async call(target, payload, options) {
+      // Checked only at entry: this in-process transport does no I/O, so
+      // nothing yields between here and the handler call below, and a signal
+      // that aborts mid-flight is never observed. In-process tests therefore
+      // cannot exercise a mid-call timeout path — that needs a real transport.
       if (options.signal?.aborted) return failure(RPC_ERROR_CODES.transport, "Call aborted");
-      const handler = handlers[`${target.service}/${target.procedure}`];
+      const key = `${target.service}/${target.procedure}`;
+      // Object.hasOwn, not plain indexing: a prototype-inherited key (e.g.
+      // "constructor/toString") would otherwise resolve to a function that
+      // is not one of our handlers.
+      const handler = Object.hasOwn(handlers, key) ? handlers[key] : undefined;
       if (!handler) return failure(RPC_ERROR_CODES.unknown, "Unknown procedure");
       try {
         return await handler(payload, options.identity);