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f7429ee963 feat: Stage 1 — TimelineReconstructor for multi-agent diagnose pipeline (issue #29)
- Add app/services/diagnose/timeline.py: pure-Python TimelineReconstructor
  - Sorts entries by timestamp_iso (None entries appended at end)
  - Sliding-window clustering anchored to first entry in each cluster
  - Computes cluster_id (sha1[:12]), severity (highest wins), burst flag,
    gap_before_seconds, representative_text (highest rank, longest text tiebreak)
  - Builds TimelineResult with dominant_sources sorted by entry count descending
- Update pipeline.py stub to import TimelineReconstructor (Task 6 wiring prep)
- Add tests/test_diagnose_timeline.py: 15 tests covering all 13 required cases
  plus null-timestamp edge case variant; all 318 tests passing

Closes: #29
2026-05-25 12:54:15 -07:00