Srilekha ebba583c66 feat(cohort): reconcile 500-artist telemetry, update avatars, and add drift detection ...

- Decouple commercial CSPC sales columns from the 500 cohort telemetry feed
- Synchronize 100% canonical platform URLs (YouTube, Spotify, Instagram) from hiffi_catalog.db to hiffi_multiplatform_500.csv
- Enforce Tier-1 zero-imputation policy for Hak (@haknyc) with RFC 8259-compliant nulls
- Reconcile and crop portrait avatar assets across cohort entities
- Implement automated drift detector and velocity circuit breaker (drift_detector.py)

2026-11-06 11:55:25 +05:30

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