Updates to molten.bot, Agent_00.

Added agent-readable discovery metadata with a well-known API catalog, public agent skill index, auth documentation, and link headers for llms.txt and llms-full.txt.

Added Markdown negotiation for the homepage and clarified public-site auth metadata so agents see crawling as token-free without advertising the app shell as an OAuth server.

Fixed duplicate task handling so reviewer lists and requested PR reviewers are part of task dedupe keys, preventing tasks for different reviewers from being collapsed together.

Kept reviewer metadata in broker snapshots, rejected submissions, and completed-history grouping so dashboard history shows reviewer-specific task records.