_refresh_ai_rows deleted only unconfirmed AI rows, then bulk-inserted freshly
generated rows keyed by a deterministic uuid5 of (template_id, semantic key).
A confirmed ghost keeps that id, so a re-run re-emitted it → primary-key
conflict that failed the whole insert batch (reachable: auto-map is blocked only
when marks exist, not when ghosts are confirmed).
Fix: after the delete, read the ids that survived (confirmed-AI + manual) and
skip re-inserting any freshly generated row whose id matches — preserving the
teacher's curated row and making the insert PK-safe.
Adds test_auto_map_rerun_after_confirm_does_not_pk_collide, which confirms a
ghost at its REAL generated id (the prior test used an arbitrary id that never
collided) and asserts the row survives exactly once with confirmed=True.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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