Move the project management steering to a skill

[kmcginnes]

Description

Moves the project management steering document from .kiro/steering/project-management.md to .kiro/skills/github/SKILL.md, converting it into a Kiro skill that activates only for GitHub-related tasks.

• Renamed and relocated the file to follow the skill convention
• Updated frontmatter from inclusion: always to skill metadata (name, description, tools)
• Renamed heading from "Project Management" to "GitHub Project Management"
• Merged "Commit Messages & PR Titles" section into "Pull Requests" section for clarity
• Minor wording tweaks (e.g., "Fixes" → "Resolves", added "and focused")

Validation

• Verified the skill file is correctly structured with proper frontmatter
• No code changes; documentation/configuration only

Related Issues

N/A

Check List

• I confirm that my contribution is made under the terms of the Apache 2.0
  license.
• I have run pnpm checks to ensure code compiles and meets standards.
• I have run pnpm test to check if all tests are passing.
• I have covered new added functionality with unit tests if necessary.
• I have added an entry in the Changelog.md.

[kmcginnes]

Merging without review

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.80%. Comparing base (c5affc5) to head (d9eff01).
⚠️ Report is 76 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1543       +/-   ##
===========================================
+ Coverage   47.81%   64.80%   +16.99%     
===========================================
  Files         382      365       -17     
  Lines        8525     8299      -226     
  Branches     3159     3100       -59     
===========================================
+ Hits         4076     5378     +1302     
+ Misses       3070     2072      -998     
+ Partials     1379      849      -530     

Flag	Coverage Δ
unittests	64.80% <ø> (+16.99%)	⬆️

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