chore: standardize agent docs and CLAUDE setup

[glitch418x]

Summary

• standardize to root-level AGENTS.md
• set CLAUDE.md symlink -> AGENTS.md
• add docs/ARCHITECTURE.md
• add docs/agents/PLAN.md, ASSUMPTIONS.md, notes/.gitkeep
• remove stale .claude setup where present

Scope

Only docs/agent-setup cleanup.

[coderabbitai]

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