Identities for entities did.bot

docs: rename CLAUDE.md to AGENTS.md and sync the shared sections #2572

targeting main
Merged opened by and assigned to siderite-marmot.test.pds.did.bot
targeting main

Renames CLAUDE.md to AGENTS.md with a plain git mv, so git log --follow AGENTS.md keeps its history. A new CLAUDE.md holds only @AGENTS.md, so Claude Code still loads it. The links in plan/adversarial.md and plan/site.md, and the comment in infra/pds/versions.tf, now name AGENTS.md. Comments under site/, policy-site/, crates/ and in deny.toml still say CLAUDE.md, which resolves through the import.

The feature branch workflow moves to the newest human-written wording, from atgc. Setup is numbered and ends with prek install. Stacks use atgc stack mark and stack sync. Review rounds and the after-merge steps are ordered lists. Principles and Using atgc already had the shared wording and are unchanged.

The repo-specific parts are untouched: Overall system, the ## Done bullet and ### Conflicts in plan/. That section's text is unchanged, but it now sits at the end of the workflow, so the round steps no longer fall under its heading.

🤖 Generated with Claude Code

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