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Phase 2 T44 deferred interjection regenerate — when the original turn group included a follow-on interjection beat we left it untouched. Now regenerate redoes BOTH halves: - Detect a sibling interjection by looking up assistant_turn events pinned to the same user_turn_id with `interjection_of` set. - After streaming the new primary, run `detect_interjection` against the new primary text. - If True: stream a new interjection from the silent witness, append with `interjection_of=<new primary speaker_id>`, supersede the original interjection, and re-run memory + state-update for the new beat. - If False: supersede the original interjection without a replacement (back-pointer goes to the new primary so the row stays consistently hidden). Also broadcast a `turn_html_replace` event for the new interjection so the front-end can swap the prior interjection node in place (mirrors T73.1's primary swap). Tests: - `test_regenerate_with_interjection_redoes_both_turns`: classifier returns True; assert two new assistant_turns land for the same user_turn, second carries `interjection_of`, originals superseded. - `test_regenerate_drops_interjection_when_classifier_returns_false`: classifier returns False; assert one new assistant_turn (primary only) and the original interjection is superseded with no replacement. `interjection_of` carries the primary's *speaker_id* (matching the existing convention in chat/web/turns.py) rather than the event_id.