chore: add release publishing skill

[jafreck]

Adds a Copilot skill at .claude/skills/cadre-release/SKILL.md with step-by-step instructions for publishing @cadre-dev/cadre and @cadre-dev/framework to npm.

Covers:

• Bumping versions and creating PRs
• Verifying versions before tagging
• Triggering publish.yml (via GitHub Release) and publish-framework.yml (via tag push)
• Releasing both packages together
• Fixing bad tags

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.36%. Comparing base (322ba7f) to head (6df108c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #404   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files         213      213           
  Lines       22862    22862           
  Branches     3584     3585    +1     
=======================================
  Hits        20887    20887           
  Misses       1927     1927           
  Partials       48       48           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.