chore(frank-tts): repoint narrator slots to the live voice packs

Frank replaced the narrator1/2/3 packs with cloned character voices
(wilwheaton, vaati, dr.kern, garrickhagon, jeffhays). The three narrator
slots are now carried by real packs: narrator1=wilwheaton, narrator2=vaati,
narrator3=dr.kern.

- frank-tts.env DEFAULT_VOICE narrator1 -> wilwheaton (a voice-less request
  400'd on the dead name; wilwheaton is narrator1's successor).
- Docs: correct the /health census and the podcast-speaker references in
  Frank TTS.md and Open Notebook.md to the live packs. Dated 2026-10-18/19
  measurement logs are left as history.

Open Notebook's live dank-duo speaker profile was repointed over REST
(Frank->wilwheaton, Comrade->vaati) - app-side, not in this commit.
Bats fixtures keep narrator1 as a self-contained sample pack; untouched.

scripts/frank-tts.env

@@ -7,7 +7,7 @@
 # whichever TTS engine wins the engine decision (dankclaw/voiceservice/app.py
 # is a single stdlib-only file in a locally built image). Consumers — omp's
 # TTS device, OpenWebUI, open-notebook — address a VOICE BY NAME
-# (voice=narrator1, or the harness' voice_id=narrator1) and never see a path:
+# (voice=wilwheaton, or the harness' voice_id=wilwheaton) and never see a path:
 # a name is real exactly when /voices/<name>/reference.wav exists, and
 # anything else is a 400 that lists the names that are.
 #
@@ -65,7 +65,7 @@ TTS_UPSTREAM_MODEL=voxcpm2
 # name still 400s with the list that exists — this covers the absent case only —
 # and the journal marks such a line `(default)` so an unrequested voice never
 # reads as a requested one. Any pack directory in /home/dank/voices is legal.
-DEFAULT_VOICE=narrator1
+DEFAULT_VOICE=wilwheaton
 
 # CLI-backend knobs, inert while TTS_BACKEND=omni-http. Empty means "not
 # configured": the endpoint answers a 500 that says so instead of running