Assemble AI league upon PR marked for review

[4444J99]

Signal: a-bat-signal

Whenever a pull request is marked for review, all available AI league agents (such as @Copilot, @claude, @gemini-cli, @codex) should assemble within the repository. They should:

• Sort responsibilities among themselves
• Relay subsequent actions/tasks to assigned agents

This issue formalizes the request:

"Upon PR marked for review, all available AI league assembles, sort responsibilities betwixt, then relay;"

Participants:

• @Copilot
• @claude
• @gemini-cli
• @codex

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Assigned: @4444JPP
Signal: a-bat-signal

Criteria for completion:

• Automated detection of 'PR marked for review'
• AI agents notified and assembled
• Responsibilities distributed and relayed

Referenced content from issue #17 per user request.