The Phase 1 single-bot ``record_turn_memory`` lingered next to the
unified ``record_turn_memory_for_present`` introduced in T84. Only test
fixtures still called the legacy entry point.
- Remove ``record_turn_memory`` from ``chat/services/memory_write.py``.
- Update the two test_memory_write.py callers to use
``record_turn_memory_for_present(..., guest_bot_id=None)``, which
produces the same ``[you=1, host=1, guest=0]`` witness mask.
The unified API returns ``dict[bot_id, (event_id, memory_id)]``; tests
extract the host entry. No production callers were affected.
Extends record_turn_memory_for_present with a you_present: bool = True
kwarg so a single entry-point covers both you-scenes (witness_you=1)
and meanwhile scenes (witness_you=0). Validates that meanwhile callers
provide a guest_bot_id.
record_meanwhile_memory becomes a thin backward-compat wrapper that
delegates with you_present=False, preserving the call site in
chat/web/meanwhile.py without churn.
Joseph Doherty