Add greenfield GitHub baseline guide for PM/BA setup

[sebastientaggart]

Adds practical GitHub configuration guidance for new projects: recommended labels for issue triage and QA lifecycle, milestone strategy tied to /start behavior, and a greenfield path in /setup when a repo has no labels yet. Template comments mirror the same baseline for teams copying codecannon.yaml.

Also documents pulling latest before /version and regenerates Claude command files from the updated skills.

Issue #7

Made with Cursor

[sebastientaggart]

Code review (AI)

Verdict: APPROVE

Summary

• README and skills/setup.md give a clear, actionable greenfield baseline for labels, QA lifecycle, and milestones aligned with /start and /qa.
• Template comments in codecannon.yaml match the same story for new projects.
• skills/version.md addition to git pull before versioning is reasonable.

Notes (non-blocking)

• Generated .claude/commands/*.md still contain empty backticks where placeholders resolve to empty strings (e.g. BRANCH_TEST, QA labels). Worth a future sync improvement for readability; not introduced solely by the PM/BA content.