HS E36: RPC timeout tests (10, 11, 14) — 16/16 complete

All 16 socket tests now green.

Fake synchronous setTimeout queue (__hsFlushTimers) lets the synchronous
test harness drive RPC timeout tests without real async waiting:
- default timeout: flush timers → wrapper.pending emptied (rejected)
- noTimeout: flush timers → wrapper.pending still has entry (not rejected)
- timeout(n): flush timers → 50ms timer fires → pending emptied

_rpcDispatch handles "noTimeout"/"timeout" method names, returning
new proxy or timeout-factory function respectively.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/hs-run-filtered.js

@@ -18,6 +18,28 @@ const K = globalThis.SxKernel;
 // awaits RPC promises; rejections from timed-out or unresolved calls are expected.
 process.on('unhandledRejection', () => {});
 
+// ─── Fake timer (for RPC timeout tests) ────────────────────────────────────
+// socket timeout tests need setTimeout to fire synchronously on demand.
+// Replace global setTimeout with a queue; __hsFlushTimers fires all pending.
+let _fakeTimers = [];
+let _fakeTimerIdCtr = 0;
+const _realSetTimeout = globalThis.setTimeout;
+globalThis.setTimeout = function(cb, _delay) {
+  const id = ++_fakeTimerIdCtr;
+  _fakeTimers.push({ id, cb });
+  return id;
+};
+globalThis.clearTimeout = function(id) {
+  const idx = _fakeTimers.findIndex(t => t.id === id);
+  if (idx >= 0) _fakeTimers.splice(idx, 1);
+};
+// __hsFlushTimers — drain all pending timers synchronously.
+// Exposed as a plain object so host-call o "call" works.
+globalThis.__hsFlushTimers = { call: function() {
+  const batch = _fakeTimers.splice(0);
+  for (const { cb } of batch) { try { cb(); } catch (_) {} }
+}};
+
 // Step limit API — exposed from OCaml kernel
 const STEP_LIMIT = parseInt(process.env.HS_STEP_LIMIT || '200000');
 
@@ -760,6 +782,7 @@ for(let i=startTest;i<Math.min(endTest,testCount);i++){
   globalThis.__hsMutationRegistry.length = 0;
   globalThis.__hsMutationActive = false;
   globalThis.__currentHsTestName = name;
+  _fakeTimers = []; // reset timer queue between tests
 
   // Enable step limit for timeout protection
   setStepLimit(STEP_LIMIT);