- Hash ID generation now returns full 64-char SHA256 - Progressive collision handling: 6→7→8 chars on INSERT failure - Added child_counters table for hierarchical IDs - Updated all docs to reflect 6-char design - Collision math: 97% of 1K issues stay at 6 chars Next: Implement progressive retry logic in CreateIssue (bd-168) Amp-Thread-ID: https://ampcode.com/threads/T-9931c1b7-c989-47a1-8e6a-a04469bd937d Co-authored-by: Amp <amp@ampcode.com>