Preserve decision sequence in recall spans

[Sahith59]

The final recall-control QA reached the correct source session but still answered Fissionator incorrectly because the reserve selected a later design exchange and equal-timestamp packing obscured the earlier naming decision.

This change keeps the existing session admission/ranking boundary, then uses source-only decision cues inside the selected session to reserve the proposal, user acceptance, and immediate continuation in original dialogue order. On the frozen corpus, only the Fissionator packet changes relative to the previous final candidate; all other 109 final packets remain byte-identical.

Validation:

• pytest -q tests/test_recall_span_adapter.py — 10 passed
• frozen all54 packet gate and independent verification pass; exact49-case admission set retained,49/49 selected gold sessions, no session loss
• frozen final110 composition and independent verification pass; only 561fabcd changes from candidate002
• no paid call was used for this offline repair