Document Cursor as peer agent platform

[jaywedgeworth22]

Summary

• add a Cursor project rule that points agents back to AGENTS.md
• document Cursor as a peer branch prefix alongside Codex, Claude, Copilot, and Antigravity
• update README, Claude handoff notes, STATUS, and PR template to use the same named agent set

Coordination

• Branch prefix: codex/
• Checked git status --short --branch, git worktree list, and open PRs
• Open PRs Show market data and performance cache health in admin diagnostics #105/Add cross-app integration capabilities manifest #106 do not overlap these root coordination docs

Verification

• git diff --check
• Docs-only change; app typecheck/tests not run

Production Impact

• No app deploy, migration, provision, remote D1 action, or production script run

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