Session file rotation breaks bootstrap — compaction never triggers (PR #190)

[glfruit]

Summary

PR #190 (open since 2026-03-26) fixes a critical bug where session file rotation (after /reset or natural rotation) causes LCM bootstrap() to enter a dead loop:

1. New session file path ≠ old path → skips fast paths ✅
2. reconcileSessionTail() finds no overlap → hasOverlap: false ✅
3. bootstrapState never updated (only updates on hasOverlap: true) ❌
4. Next call: same stale path, same dead loop → compaction never triggers

Production Impact

• compaction_events: 0 rows (never compacted)
• Session tracked wrong .jsonl file (815KB, stale)
• Two agents hit context overflow with compactionAttempts: 0/1

Proposed Fix

Add rotation detection before the fast-path guard in bootstrap() — when path changes, purge stale conversation data and re-bootstrap fresh. Full diff in PR #190.

Workaround

We have applied the patch locally and it resolves the issue. Would love to see this merged upstream.

cc @jalehman