fdfe023698
Add third SQL query (bucket_rows) aggregating deals_total_count by
room_bucket ('студия','1','2','3','4+') across mapped competitors.
New fields:
- VelocityResult.by_room_bucket: aggregate {units, sqm, complexes_count}
- sample_competitors[].by_room_bucket: {bucket: units}
Bucket query wrapped в SAVEPOINT — failure degrades gracefully к empty
dict без abort outer tx.
CAST(:window_interval AS interval) pattern per PR #160 lesson.
Test coverage: 3 new tests (aggregation, empty fallback, sample entries).
Closes part of #161
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