Add loop-triage constraints example for Cursor

[cobusgreyling]

Goal

Grok, Claude, Codex, and Opencode ship constraints.md examples. Add Cursor equivalent.

Files

• Create examples/cursor/constraints.md
• Link from examples/cursor/README.md

Acceptance criteria

• Mirror structure of examples/grok/constraints.md
• Map constraints to .cursor/rules/ or AGENTS.md
• Reference docs/safety.md for denylist and human gates

Estimated time: ~30 minutes

[cobusgreyling]

Community announcement with help-wanted table and merge highlights: #130 — comment "I'll take this" here to get assigned.