- Added deduplicateIncomingIssues() to consolidate content-identical issues - DetectCollisions now deduplicates within incoming batch before processing - Keeps issue with smallest ID when duplicates found - Added comprehensive test suite in collision_dedup_test.go - Export clean JSONL with bd-421 fix applied Amp-Thread-ID: https://ampcode.com/threads/T-c17dd8bf-c298-4a80-baa5-55fa7c7bb9a3 Co-authored-by: Amp <amp@ampcode.com>