The open/import transcript stitcher (get_state_db_session_messages with
stitch_continuations=True) runs its own lineage SELECT that omitted
session_source/model_config, so the shared _is_continuation_session guard
added for the listing path never fired there: an explicit branch/delegate
child (model_config._branched_from/_delegate_from) starting within the 2s
tolerance window got its rows stitched into the parent transcript on open.
Select both identity columns when the schema has them (NULL AS fallback for
older state.db schemas), so the same guard applies in the stitch path.
Tests (tests/test_session_lineage_metadata_api.py):
- branched/delegate children inside the tolerance stay out of the parent
transcript on open/import (fail before this fix, pass after);
- old-schema rows without the identity columns still stitch genuine
compression continuations (no crash, no behavior change).
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