Widen daily memory filename discovery so slugged session-memory files flow through Dreaming, rem-backfill, rem-harness, doctor, and short-term promotion.
Preserve exact slugged source paths during historical seeding and rem-backfill attribution, including multiple files for the same day.
Add regression coverage for slugged ingestion, rem-backfill, rem-harness preview paths, and doctor backfill day extraction.
Fixes#69536.
Co-authored-by: Jack Storment <crazycoder131@gmail.com>
b79c41d252
