Skills in the Dynamo Repo can be improved

[QilongTang]

Summary

Several canonical skills under .agents/skills/ are inconsistent with the quality standards recently introduced in dynamo-skill-writer (see SetupUpdate branch). This issue tracks the proposed improvements.

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Proposed changes

High priority

dynamo-dotnet-janitor

• Description is too vague to trigger reliably. Suggested replacement:

  "Perform janitorial cleanup and modernization of C#/.NET code in Dynamo. Use when removing dead code, updating to modern C# syntax, resolving analyser warnings, fixing naming violations, or reducing technical debt — without changing behavior."

• Missing all standard sections: When to use, When not to use, Inputs expected, Output format, Boundaries.
• References microsoft.docs.mcp tool with no availability caveat — should be noted as optional.

dynamo-ecosystem-reviewer

• Body is ~12 lines with no standard sections: When to use, When not to use, Inputs expected, Output format, Boundaries.
• Add these from the existing prose.

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Medium priority

Add Boundaries sections (✅ Always / ⚠️ Ask first / 🚫 Never) to:

• dynamo-dotnet-expert — relevant for PublicAPI.Unshipped.txt edits and public API changes
• dynamo-jira-ticket — relevant for filing tickets in an external system
• dynamo-onboarding — should be documented as read-only to prevent unintended edits
• dynamo-ecosystem-reviewer — read-only review; easy to make explicit

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Low priority

dynamo-content-designer and dynamo-ux-designer

• Both have a stray metadata:\n version: "1.0" frontmatter field not present in any other skill.
• No functional impact but inconsistent; remove to keep frontmatter stable.

dynamo-codebase-patterns

• Launches directly into prose without When to use / When not to use headers.
• Add these for consistency with the rest of the skill catalog.

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Acceptance criteria

• dynamo-dotnet-janitor description updated; standard sections added; optional tool noted
• dynamo-ecosystem-reviewer standard sections added
• Boundaries sections added to dynamo-dotnet-expert, dynamo-jira-ticket, dynamo-onboarding, dynamo-ecosystem-reviewer
• Stray metadata: frontmatter removed from dynamo-content-designer and dynamo-ux-designer
• When to use / When not to use headers added to dynamo-codebase-patterns
• .agents/README.md Quick Reference descriptions updated where skill scope changed
• Wrapper sync check passes: ./.github/scripts/sync_agent_wrappers.ps1 -Check