feat(stt): default Deepgram to nova-3 + multi-language, configurable via env

Bumps the default Deepgram streaming model from nova-2 to nova-3 and the
default language from English-only to "multi" so meeting transcription
works out of the box for non-English speakers.

Both are now overridable without code changes via DISCLI_DEEPGRAM_MODEL
and DISCLI_DEEPGRAM_LANGUAGE.

Version: 0.9.0 -> 0.9.1.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: DevRohit06

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "discord-cli-agent"
-version = "0.9.0"
+version = "0.9.1"
 description = "Discord CLI for AI agents"
 readme = "README.md"
 license = "MIT"

src/discli/stt.py

@@ -76,7 +76,8 @@ async def stream_session(
         *,
         sample_rate: int = 48000,
         channels: int = 1,
-        model: str = "nova-2",
+        model: str | None = None,
+        language: str | None = None,
     ) -> AsyncIterator[TranscriptionResult]:
         """Stream audio to Deepgram's live transcription websocket and yield
         ``TranscriptionResult`` objects as they arrive.
@@ -97,8 +98,14 @@ async def stream_session(
         import json as _json
         from urllib.parse import urlencode
 
+        if model is None:
+            model = os.environ.get("DISCLI_DEEPGRAM_MODEL", "nova-3")
+        if language is None:
+            language = os.environ.get("DISCLI_DEEPGRAM_LANGUAGE", "multi")
+
         params = {
             "model": model,
+            "language": language,
             "encoding": "linear16",
             "sample_rate": str(sample_rate),
             "channels": str(channels),