Ep13 publish, MLX whisper, voicemail system, hero redesign, massive topic expansion

- Switch whisper transcription from faster-whisper (CPU) to lightning-whisper-mlx (GPU)
- Fix word_timestamps hanging, use ffprobe for accurate duration
- Add Cloudflare Pages Worker for SignalWire voicemail fallback when server offline
- Add voicemail sync on startup, delete tracking, save feature
- Add /feed RSS proxy to _worker.js (was broken by worker taking over routing)
- Redesign website hero section: ghost buttons, compact phone, plain text links
- Rewrite caller prompts for faster point-getting and host-following
- Expand TOPIC_CALLIN from ~250 to 547 entries across 34 categories
- Add new categories: biology, psychology, engineering, math, geology, animals,
  work, money, books, movies, relationships, health, language, true crime,
  drunk/high/unhinged callers
- Remove bad Inworld voices (Pixie, Dominus), reduce repeat caller frequency
- Add audio monitor device routing, uvicorn --reload-dir fix
- Publish episode 13

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

website/_worker.js

@@ -0,0 +1,64 @@
+const VOICEMAIL_XML = `<?xml version="1.0" encoding="UTF-8"?>
+<Response>
+    <Say voice="woman">Luke at the Roost is off the air right now. Leave a message after the beep and we may play it on the next show!</Say>
+    <Record maxLength="120" action="https://radioshow.macneilmediagroup.com/api/signalwire/voicemail-complete" playBeep="true" />
+    <Say voice="woman">Thank you for calling. Goodbye!</Say>
+    <Hangup/>
+</Response>`;
+
+export default {
+  async fetch(request, env) {
+    const url = new URL(request.url);
+
+    if (url.pathname === "/api/signalwire/voice") {
+      try {
+        const body = await request.text();
+        const resp = await fetch("https://radioshow.macneilmediagroup.com/api/signalwire/voice", {
+          method: "POST",
+          headers: { "Content-Type": "application/x-www-form-urlencoded" },
+          body: body,
+          signal: AbortSignal.timeout(5000),
+        });
+
+        if (resp.ok) {
+          return new Response(await resp.text(), {
+            status: 200,
+            headers: { "Content-Type": "application/xml" },
+          });
+        }
+      } catch (e) {
+        // Server unreachable or timed out
+      }
+
+      return new Response(VOICEMAIL_XML, {
+        status: 200,
+        headers: { "Content-Type": "application/xml" },
+      });
+    }
+
+    // RSS feed proxy
+    if (url.pathname === "/feed") {
+      try {
+        const resp = await fetch("https://podcast.macneilmediagroup.com/@LukeAtTheRoost/feed.xml", {
+          signal: AbortSignal.timeout(8000),
+        });
+        if (resp.ok) {
+          return new Response(await resp.text(), {
+            status: 200,
+            headers: {
+              "Content-Type": "application/xml",
+              "Access-Control-Allow-Origin": "*",
+              "Cache-Control": "public, max-age=300",
+            },
+          });
+        }
+      } catch (e) {
+        // Castopod unreachable
+      }
+      return new Response("Feed unavailable", { status: 502 });
+    }
+
+    // All other requests — serve static assets
+    return env.ASSETS.fetch(request);
+  },
+};