Add Streamlit meeting assistant MVP

docs/architecture.md

@@ -27,7 +27,7 @@ subprocess.
 
 ```text
 Source audio
-    -> FFmpeg normalization/preparation
+    -> FFmpeg preparation (normalization optional, default on)
     -> mono, 16 kHz PCM WAV
     -> whisper.cpp transcription with large-v3-turbo
     -> optional pyannote.audio Community-1 diarization
@@ -85,7 +85,11 @@ this context and its mappings.
 
 Meeting Lab uses FFmpeg to prepare a consistent local-processing input. The
 current practical target is mono, 16 kHz PCM WAV. The imported source remains a
-separate source artifact.
+separate source artifact. Preparation always runs for WAV, FLAC and M4A,
+regardless of the normalization switch. When enabled, Meeting Lab currently
+uses `loudnorm=I=-16:LRA=11:TP=-1.5`, an isolated conservative default for
+speech recordings that may be revisited after empirical comparison. Meeting
+Assistant passes only an on/off choice and does not own filter parameters.
 
 ### Transcription
 
@@ -137,6 +141,15 @@ and reviewed protocols are derived versions. Generated artifacts should retain
 their input version, backend/model configuration, prompt version and timestamp
 where practical.
 
+## Later Post-Run Correction Flow
+
+Post-run corrections are planned as a separate, non-mandatory workflow after
+initial protocol generation. As detailed in [ADR 0012](adr/0012-post-run-corrections.md),
+confirmed name, person and anonymous-speaker corrections should become
+meeting-specific knowledge. They may then be applied deterministically to safe
+derived artifacts or used for protocol-only regeneration without needlessly
+rerunning transcription or diarization.
+
 ## Future Extensions
 
 - shorter distribution protocols