v0.13.0:0 - revert WhisperX migration; back to Parakeet + Sortformer

After five hotfix iterations on the WhisperX install (v0.12.0:0–:4) we
never got a working docker build. The fundamental constraint isn't
patchable from outside NVIDIA: NGC PyTorch on ARM64 (the only base that
runs on Spark 2's GB10 Blackwell) ships a custom-versioned torch
2.10.0a0+b558c98 that has no pre-built torchaudio match anywhere.
WhisperX → pyannote → torchaudio is a hard dependency chain we couldn't
satisfy without rebuilding torchaudio against torch 2.10's alpha API.
Walking away cleanly is better than another night of chasing.

Removed from the codebase:
  - image/whisperx_container/* (Dockerfile + requirements + app/main.py)
  - image/app/whisperx_install.py (install manager + SSH ship-context logic)
  - image/Dockerfile COPY whisperx_container
  - WHISPERX_* config keys in config.py
  - whisperx service entry in services.py
  - WhisperX-preferred branch in audio_proxy.py
  - /api/whisperx/* endpoints in server.py
  - install banner + progress dialog in index.html
  - render + handlers in app.js
  - .whisperx-install styles in style.css

Spark 2 cleaned in tandem (user-authorized): container removed,
~/whisperx-build/ removed, 5.4 GB of dangling image layers + 1.3 GB of
builder cache reclaimed. parakeet-asr and magpie-tts unaffected and
healthy throughout.

The audio path is back to exactly what shipped in v0.11.0:3:
  POST /api/audio/transcribe-with-speakers
    → Parakeet (transcription) + Sortformer (diarization) in parallel
    → merged by timestamp into speaker-labeled blocks

v0.13.0:1+ will add the actually-needed fixes that the WhisperX detour
was meant to address:
  1. memory cap on the parakeet-asr container so a long-audio crash
     can't swap-thrash Spark 2 again
  2. a chunking proxy in /api/audio/transcribe-with-speakers that
     splits inputs >10 min before Sortformer

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

image/app/static/app.js

@@ -664,116 +664,10 @@ async function onSpeechModelsRestart() {
   }
 }
 
-// ===================== WhisperX install (v0.12) =====================
-
-const wxState = {
-  job_id: null,
-  eventsource: null,
-  timer_handle: null,
-  started_at: null,
-};
-
-async function renderWhisperXBanner() {
-  const card = el('#whisperx-install-card');
-  if (!card) return;
-  let status;
-  try {
-    status = await fetchJSON('/api/whisperx/status');
-  } catch {
-    card.classList.add('hidden');
-    return;
-  }
-  if (status.installed && status.healthy) {
-    card.classList.add('hidden');
-  } else if (status.configured) {
-    card.classList.remove('hidden');
-  } else {
-    card.classList.add('hidden');
-  }
-}
-
-async function onWhisperXInstall() {
-  if (wxState.job_id) {
-    // Just re-attach to the running job
-    showWhisperXDialog();
-    return;
-  }
-  if (!confirm('Install WhisperX on Spark 2? This builds a new Docker image (~10–15 min first time, mostly downloading pyannote + whisper weights). Parakeet/Magpie stay untouched.')) return;
-  try {
-    const r = await fetchJSON('/api/whisperx/install', { method: 'POST' });
-    attachToWhisperXInstall(r.job_id);
-  } catch (e) {
-    alert('Failed to start WhisperX install: ' + e.message);
-  }
-}
-
-function showWhisperXDialog() {
-  el('#whisperx-progress-dialog').showModal();
-}
-
-function attachToWhisperXInstall(jobId) {
-  wxState.job_id = jobId;
-  el('#wx-prog-title').textContent = 'Installing WhisperX…';
-  el('#wx-prog-phase').textContent = 'Starting…';
-  el('#wx-prog-log').textContent = '';
-  showWhisperXDialog();
-
-  // Tick a timer
-  wxState.started_at = Date.now();
-  if (wxState.timer_handle) clearInterval(wxState.timer_handle);
-  wxState.timer_handle = setInterval(() => {
-    const sec = Math.max(0, Math.floor((Date.now() - wxState.started_at) / 1000));
-    const m = Math.floor(sec / 60);
-    el('#wx-prog-elapsed').textContent = `${m}:${(sec % 60).toString().padStart(2, '0')}`;
-  }, 500);
-
-  // Backfill snapshot then connect SSE
-  fetchJSON(`/api/whisperx/install/${jobId}`).then((snap) => {
-    el('#wx-prog-phase').textContent = snap.phase || 'Working…';
-    el('#wx-prog-log').textContent = (snap.lines || []).join('\n');
-    el('#wx-prog-log').scrollTop = el('#wx-prog-log').scrollHeight;
-    if (snap.finished_at) {
-      handleWhisperXDone(snap);
-      return;
-    }
-    const es = new EventSource(`/api/whisperx/install/${jobId}/stream`);
-    wxState.eventsource = es;
-    es.onmessage = (ev) => {
-      try {
-        const log = el('#wx-prog-log');
-        log.textContent += JSON.parse(ev.data).line + '\n';
-        log.scrollTop = log.scrollHeight;
-      } catch {}
-    };
-    es.addEventListener('phase', (ev) => {
-      try { el('#wx-prog-phase').textContent = JSON.parse(ev.data).phase; } catch {}
-    });
-    es.addEventListener('done', (ev) => {
-      try { handleWhisperXDone(JSON.parse(ev.data)); } catch {}
-      es.close();
-      wxState.eventsource = null;
-    });
-    es.onerror = () => { es.close(); wxState.eventsource = null; };
-  }).catch(() => {});
-}
-
-function handleWhisperXDone(d) {
-  if (wxState.timer_handle) { clearInterval(wxState.timer_handle); wxState.timer_handle = null; }
-  wxState.job_id = null;
-  const rc = d.returncode;
-  if (d.state === 'failed' || (rc !== 0 && rc != null)) {
-    el('#wx-prog-title').textContent = `WhisperX install failed (rc=${rc})`;
-    el('#wx-prog-phase').textContent = 'Failed — check the build log below';
-  } else {
-    el('#wx-prog-title').textContent = 'WhisperX installed';
-    el('#wx-prog-phase').textContent = 'Ready ✓ — appears in Always-on services below';
-    // Refresh services + banner state
-    setTimeout(() => {
-      renderServices();
-      renderWhisperXBanner();
-    }, 1000);
-  }
-}
+// NOTE: a WhisperX install action lived here briefly in v0.12 but was
+// reverted in v0.13.0:0 — the NGC PyTorch container on ARM64 doesn't ship
+// torchaudio and we couldn't reliably build it from source. The existing
+// Parakeet + Sortformer pipeline stays as the audio path. See release notes.
 
 async function onServiceAction(key) {
   if (state.service_action_in_flight) return;
@@ -1971,11 +1865,6 @@ async function init() {
   } catch {}
   setupDashboardTabs();
   setupEndpointCollapse();
-  // WhisperX install button
-  const wxBtn = el('#wx-install');
-  if (wxBtn) wxBtn.addEventListener('click', onWhisperXInstall);
-  const wxCloseBtn = el('#wx-prog-close');
-  if (wxCloseBtn) wxCloseBtn.addEventListener('click', () => el('#whisperx-progress-dialog').close());
   await loadModels();
   await pollStatus();
   await renderServices();
@@ -1985,14 +1874,11 @@ async function init() {
   loadDiskStatus();
   // Speech-model patches panel — slow over SSH, runs after first paint.
   renderSpeechModels();
-  // WhisperX install banner — show only when not yet installed/healthy.
-  renderWhisperXBanner();
   setInterval(pollStatus, 5000);
   setInterval(pollHardware, 8000);    // every 8s
   setInterval(pollUpdates, 300000);  // every 5 min
   setInterval(loadDiskStatus, 60000); // every 60s — disk state changes rarely
   setInterval(renderSpeechModels, 120000); // every 2 min — patches change rarely
-  setInterval(renderWhisperXBanner, 60000); // every 60s — auto-hides banner after install
 }
 
 init();