Document the ai_dev_support/ isolate path in P4Info.md: main stream's Paths has 'isolate ai_dev_support/...' (inherited by dev), exempting it from Merge Down/Copy Up, and record the rule that ai_dev_support/ submits stay mutually exclusive from other-folder submits.
Agent: Claude Code, Model: Claude Sonnet 5 (claude-sonnet-5), operating as bot_Claude_Anthropic.