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Schema enrichment: - transcripts table: +engine, +model_id, +inference_ms, +sample_rate, +audio_channels, +format_mode, +remove_fillers, +british_english, +anti_hallucination - New error_log table: context, error_code, message, metadata (JSON) - 5 indices on frequently queried columns Metadata pipeline: - TranscriptMetadata struct in kon-core for full provenance capture - LocalEngine tracks loaded ModelId, returns TimedTranscript with inference_ms - std::time::Instant timing around transcribe-rs inference calls - Tauri transcription commands emit inference_ms in event payloads - InsertTranscriptParams accepts all provenance fields - log_error() for structured error logging to SQLite Every transcript is now fully reproducible from its stored metadata. 23 tests passing, clippy clean. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>