docs: add Cursor git workflow reference for tracked contributions

[chronic8000]

Summary

• Adds rules/git/contributing-workflow.md — a persistent reference for Cursor agent sessions so git workflow is not re-derived each chat.
• Documents the contributor loop: sync main → focused branch → commit → push to chronic8000 fork → PR to techomancer/iris, one change at a time.
• Links the doc from CLAUDE.md so agents load it automatically before any commit, push, or PR.

This keeps AI-assisted work tracked in version control instead of accumulating untracked local diffs or oversized single commits.

Test plan

• Docs-only; markdown renders
• CLAUDE.md pointer resolves to rules/git/contributing-workflow.md

[techomancer]

thats is something that is very specific to your system with windows paths and such, i keep files like this in my ignore/ directory which is added to .gitignore and never makes it to upstream so not to pollute other people workspaces.
also claude supports local md. CLAUDE.local.md which can be added to gitignore as well and keep peoples local settings. I dont know if cursor suports such stuff. claude also has nice include directive so AGENTS.md can be included in CLAUDE.md which contains additional claude instructions, again, not sure about cursor.

[chronic8000]

Fair point — closing this. Moved the workflow to local \ignore/cursor-git-workflow.md\ (already gitignored here) instead of upstream. Thanks for the CLAUDE.local.md / ignore/ tip.