Maps every Constitution-alpha acceptance criterion (DESIGN §8) to its merged PR, and drafts the Gitea release notes for the v0.0.39-alpha tag. For the Lead to use when cutting the tag after P5 #605 -> P6 #607 -> aiguide #8 merge. Refs #606, #542 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01EsgTQzV5YUGk1JtCLP4B83