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

scripts/dist.mjs

@@ -1,13 +1,18 @@
 // Packages the app with electron-builder using the four-part release version
 // (package.json "releaseVersion", e.g. 2.0.0.1). package.json "version" must stay semver.
 import { spawnSync } from 'node:child_process';
-import { readFileSync } from 'node:fs';
+import { existsSync, readFileSync } from 'node:fs';
 
 const pkg = JSON.parse(readFileSync('package.json', 'utf8'));
 const release = pkg.releaseVersion || pkg.version;
 const build = release.split('.')[3] ?? '0';
 const args = process.argv.slice(2);
 if (!args.some((a) => a.startsWith('--win') || a.startsWith('--linux') || a.startsWith('--mac'))) args.unshift('--win');
+// The Windows build must embed the Windows native addon (an optional dependency installed only on win32).
+if (args.some((a) => a.startsWith('--win')) && !existsSync('node_modules/sherpa-onnx-win-x64/sherpa-onnx.node')) {
+  console.error('sherpa-onnx-win-x64 is not installed: build the Windows installer on Windows (npm ci) or install it with\n  npm i --no-save --os=win32 --cpu=x64 sherpa-onnx-win-x64');
+  process.exit(1);
+}
 const result = spawnSync('npx', ['electron-builder', ...args, `--config.extraMetadata.version=${release}`], {
   stdio: 'inherit',
   shell: process.platform === 'win32',