docs(skills): document Build and Partial Rebuild exit codes for powerpoint skill

[tasdevani21]

Pull Request

Description

Adds exit code documentation to the Build and Partial Rebuild action sections of the PowerPoint skill (.github/skills/experimental/powerpoint/SKILL.md).

Contributors and agents using these actions previously had no way to distinguish a real failure (EXIT_FAILURE) from a configuration problem (EXIT_ERROR) without reading the script source. This PR surfaces the three documented exit codes (EXIT_SUCCESS, EXIT_FAILURE, EXIT_ERROR) inline next to each action, matching the sibling Dry-Run Validation section that already documents its exit codes.

Style choice: the sibling Dry-Run section uses a compact bulleted list, so the new Build and Partial Rebuild entries use the same bullet format (rather than a table) to keep all three action sections stylistically consistent, per the repo Priority Rule that codebase conventions take precedence.

Related Issue(s)

Fixes #2044

Type of Change

Code & Documentation:

• Documentation update

AI Artifacts:

• Copilot skill (.github/skills/*/SKILL.md)

Testing

Manually verified the rendered markdown matches the sibling Dry-Run Validation exit-code list format. Only SKILL.md is modified; no code, script, frontmatter, or generated docs changed.

Checklist

Required Checks

• Documentation is updated (if applicable)
• Files follow existing naming conventions
• Changes are backwards compatible (if applicable)

Required Local Checks

• Local validation aggregate: npm run validate:local
• Documentation validation (if docs changed): npm run validate:docs
• Spell checking: npm run spell-check
• Link validation: npm run lint:md-links

Security Considerations

• This PR does not contain any sensitive or NDA information
• Any new dependencies have been reviewed for security issues
• Security-related scripts follow the principle of least privilege

Additional Notes

Scope is intentionally minimal: two small bullet blocks added, no other edits to the file or repository.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.68%. Comparing base (cf29fb4) to head (70da4bd).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2554      +/-   ##
==========================================
- Coverage   82.75%   82.68%   -0.08%     
==========================================
  Files         155      143      -12     
  Lines       20960    20850     -110     
  Branches       13        0      -13     
==========================================
- Hits        17345    17239     -106     
+ Misses       3613     3611       -2     
+ Partials        2        0       -2     

Flag	Coverage Δ
docusaurus	?
pester	86.18% <ø> (-0.02%)	⬇️

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see 16 files with indirect coverage changes

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