test: port voice-reply suffix assertions, fix change-detector cap test, add AUTHOR_MAP entry

- Add output_path suffix assertions (.ogg Telegram / .mp3 non-Telegram) to
  _send_voice_reply tests, covering the OGG voice-note path that landed on
  main in ae82eed2b (the PR's third commit was redundant with it).
- Convert test_gemini_default_is_32000 back to an invariant against
  PROVIDER_MAX_TEXT_LENGTH instead of a hardcoded literal.
- Map barronlroth@gmail.com -> barronlroth in scripts/release.py.

tests/tools/test_tts_max_text_length.py

@@ -31,8 +31,8 @@ class TestResolveMaxTextLength:
     def test_mistral_default(self):
         assert _resolve_max_text_length("mistral", {}) == PROVIDER_MAX_TEXT_LENGTH["mistral"]
 
-    def test_gemini_default_is_32000(self):
-        assert _resolve_max_text_length("gemini", {}) == 32000
+    def test_gemini_default(self):
+        assert _resolve_max_text_length("gemini", {}) == PROVIDER_MAX_TEXT_LENGTH["gemini"]
 
     def test_unknown_provider_falls_back(self):
         assert _resolve_max_text_length("does-not-exist", {}) == FALLBACK_MAX_TEXT_LENGTH