teernisse eda20a9886 Add lightweight session metadata extraction service ...

Introduce extractSessionMetadata() in a new session-metadata.ts module
that extracts only what the list view needs from JSONL files:

- messageCount: Uses shared countMessagesForLine() for exact parity
- firstPrompt: First non-system-reminder user message, truncated to 200 chars
- summary: Last type="summary" line's summary field
- firstTimestamp/lastTimestamp: For duration computation

Design goals:
- Parser parity: Uses forEachJsonlLine() and countMessagesForLine() from
  session-parser.ts, ensuring list counts always match detail-view counts
- No string building: Avoids JSON.stringify and markdown processing
- 2-3x faster than full parse: Only captures metadata, skips content
- Graceful degradation: Handles malformed lines identically to full parser

This is the Tier 3 data source for JSONL-first session discovery. When
neither the sessions-index.json nor the persistent cache has valid data,
this function extracts fresh metadata from the file.

Test coverage includes:
- Output matches parseSessionContent().length on sample fixtures
- Duration extraction from JSONL timestamps
- firstPrompt extraction skips system-reminder content
- Empty files return zero counts and empty strings

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-02-28 00:52:52 -05:00

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