The previous implementation renamed old_sid.json → new_sid.json during
context compression, destroying the only persistent copy of the full
conversation history. If the summarisation LLM call also failed, the
user was left with zero recoverable messages.
Fix:
- Remove the destructive old_path.rename(new_path) call
- Preserve old_sid.json as an immutable pre-compression archive
- Create new_sid.json as a fresh file via s.save()
- Set parent_session_id on the continuation session for lineage
- Save in-memory messages to old_sid.json if they're newer than disk
Test: test_issue2223_compression_no_rename.py (6 tests, all passing)
RØG3R L!M4
5bbf18324c