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Adds migration_runner.py that executes pending migrations from migrations/ directory when backend-compliance starts. Tracks applied migrations in _migration_history table. Handles existing databases: detects if tables from migrations 001-045 already exist and seeds the history table accordingly, so only new migrations (046+) are applied. Skippable via SKIP_MIGRATIONS=true env var. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>