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/episode.html

@@ -96,6 +96,7 @@
       <a href="https://x.com/lukeattheroost" target="_blank" rel="noopener">X</a>
       <a href="https://bsky.app/profile/lukeattheroost.bsky.social" target="_blank" rel="noopener">Bluesky</a>
       <a href="https://mastodon.macneilmediagroup.com/@lukeattheroost" target="_blank" rel="me noopener">Mastodon</a>
+      <a href="https://primal.net/p/nprofile1qqswsam9cx06j7sxzpl498uquk3kgrwedxtq48j57zxkuj8fs82xtugge0wtg" target="_blank" rel="noopener">Nostr</a>
       <a href="https://open.spotify.com/show/0ZrpMigG1fo0CCN7F4YmuF?si=f990713adce84ba4" target="_blank" rel="noopener">Spotify</a>
       <a href="https://www.youtube.com/watch?v=xryGLifMBTY&list=PLGq4uZyNV1yYH_rcitTTPVysPbC6-7pe-" target="_blank" rel="noopener">YouTube</a>
       <a href="https://podcast.macneilmediagroup.com/@LukeAtTheRoost/feed.xml" target="_blank" rel="noopener">RSS</a>
@@ -108,6 +109,7 @@
         <a href="https://youtube.com/lukemacneil" target="_blank" rel="noopener">YouTube</a>
       </div>
     </div>
+    <p class="footer-contact">Support the show: <a href="https://ko-fi.com/lukemacneil" target="_blank" rel="noopener">Ko-fi</a></p>
     <p class="footer-contact">Sales &amp; Collaboration: <a href="mailto:luke@macneilmediagroup.com">luke@macneilmediagroup.com</a></p>
     <p>&copy; 2026 Luke at the Roost &middot; <a href="/privacy">Privacy Policy</a></p>
   </footer>