fix: full review pass (main process, voice pipeline, Hermes client, HUD) and e2e-validated local voice (v2.1.0.1)

Electron main
- utility-process channel: sherpa output copied into V8 buffers (Electron rejects external
  buffers), audio exchanged as base64; worker restart on timeout, identity-safe exit handling,
  deterministic native unload by restart
- webhook: loopback by default without secret, UTF-8-safe body assembly, clean restart, port validation
- files IPC: realpath-based root check, openPath allow-list (reveal-only outside document folders),
  Windows reserved names; store: debounced async atomic writes with backup of corrupt files;
  logger: streaming writes with rotation; log message size cap
- HTTP stream proxy: socket released on idle timeout / renderer destroyed, id validation
- model manager: inactivity timeout, retrying rm/rename (Windows locks), engine stopped before
  replacing a model; WAV decoder handles float/24-bit; IPC payload validation
- window: opaque rounded window on Windows, navigation lock-down, visibility events;
  Ctrl+Alt+Escape instead of the Task Manager shortcut; single-instance guard; EVEFLOW_USER_DATA

Voice pipeline
- abort semantics (SendHandle.aborted), abort before the stream opens, session id prefixes per transport
- hands-free re-arm after replies without speech, start/stop race, no chime on auto re-arm,
  no silence shipped to STT (400 ms pre-roll), no transcription of empty manual stops
- TTS: bounded prefetch, cancellable segments, non-interrupting notices, volume applied at play time
- SSE CRLF split, usage in chat completions, finish_reason length, phonetic regex hoisted

HUD
- core renderer: no canvas shadows, cached colours, reusable spectrum buffer, theme read on change,
  30 fps idle, stops when the window is hidden; ping flashes on send / tool / speech
- deltas coalesced per animation frame; stable auto-scroll; narrow selectors everywhere
- bundled fonts (offline), reduce-motion fix, error toasts, ops drawer below 1180 px,
  interim transcript and first-token latency in the core caption, Ctrl+K, dialog semantics,
  switch/aria roles, compact widget cleanup, Whisper small recommended for French
- docs/ROADMAP.md: audit results, e2e results and the plan towards a real JARVIS

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017Wn5VX9HNbJ7N54hR24u9Y

electron/ipc/http.ts

@@ -105,6 +105,8 @@ async function startStream(sender: WebContents, id: string, req: HttpProxyReques
     headers: headersToObject(response.headers)
   };
 
+  const onDestroyed = () => controller.abort();
+  sender.once('destroyed', onDestroyed);
   const pump = async () => {
     try {
       if (!response.body) {
@@ -133,7 +135,10 @@ async function startStream(sender: WebContents, id: string, req: HttpProxyReques
       if (e.name === 'AbortError') send({ id, type: 'end' });
       else send({ id, type: 'error', message: e.message || String(err) });
     } finally {
-      activeStreams.delete(id);
+      // Releases the socket when we bailed out early (idle timeout, renderer gone).
+      controller.abort();
+      sender.removeListener('destroyed', onDestroyed);
+      if (activeStreams.get(id) === controller) activeStreams.delete(id);
     }
   };
   void pump();
@@ -147,7 +152,11 @@ export function abortAllStreams(): void {
 
 export function registerHttpIpc(): void {
   ipcMain.handle(IPC.httpFetch, (_e, req: HttpProxyRequest) => proxyFetch(req));
-  ipcMain.handle(IPC.httpStreamStart, (event, id: string, req: HttpProxyRequest) => startStream(event.sender, id, req));
+  ipcMain.handle(IPC.httpStreamStart, (event, id: unknown, req: HttpProxyRequest) => {
+    if (typeof id !== 'string' || !id || id.length > 64 || activeStreams.has(id)) throw new Error('Identifiant de flux invalide');
+    if (!req || typeof req.url !== 'string') throw new Error('Requête invalide');
+    return startStream(event.sender, id, req);
+  });
   ipcMain.on(IPC.httpStreamAbort, (_e, id: string) => {
     const controller = activeStreams.get(id);
     if (controller) {