Postprod improvements: denoise, phone EQ, ad muting, ducking, voice mappings

- Add host mic noise reduction (afftdn + anlmdn)
- Add phone EQ bandpass on caller stem
- Mute music during ads with 2s lookahead/tail
- Increase ducking release to 3s to reduce pumping
- Add Inworld voice mappings for all regular callers
- Recording toggle endpoint, stem sync fixes

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

data/regulars.json

@@ -60,9 +60,13 @@
         {
           "summary": "Jerome, a police officer in Texas, called from a DQ parking lot worried about AI writing police reports after his son sent him an article suggesting it might replace him. Through the conversation, he moved from fear about accountability and accuracy in criminal cases to acknowledging that AI handling routine paperwork (like cattle complaints) could free him up to do more meaningful police work in his understaffed county, though he remains uncertain about where this technology will lead.",
           "timestamp": 1770692087.560522
+        },
+        {
+          "summary": "The caller described a turbulent couple of weeks, mentioning an issue with AI writing police reports, which he suggested was just the beginning of a larger problem. He seemed concerned about the developments and wanted to discuss the topic further with the host.",
+          "timestamp": 1770892192.893108
         }
       ],
-      "last_call": 1770692087.560523,
+      "last_call": 1770892192.89311,
       "created_at": 1770692087.560523,
       "voice": "IKne3meq5aSn9XLyUdCD"
     },