fix(skills): Fix skill tagging inconsistency between $ and / across providers

[AntonVishal]

What Changed

Fixed inconsistent skill tagging between $ and /
Enabled $ parsing for Claude (was not working)
Aligned behavior so multiple skill tags work consistently across providers

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
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Note

Fix skill tagging inconsistency by deriving Claude provider skills from slash commands

• Adds claudeSlashCommandsAsProviderSkills helper in claudeSlashCommandsAsProviderSkills.ts that maps slash commands to ServerProviderSkill objects with stable, URL-encoded paths (claude-agent:///slash-command/<name>).
• Updates checkClaudeProviderStatus in ClaudeProvider.ts to pass the derived skills array to buildServerProvider, replacing prior inconsistent tagging behavior.
• Skills are always set to enabled=true with scope="claude-agent", and description/shortDescription are populated from slash command fields when present.

^{Macroscope summarized 633533f.}

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[macroscopeapp]

Approvability

Verdict: Needs human review

This PR enables new user-facing functionality (the $ skill picker for Claude) by populating skills data that wasn't previously present. While the code is straightforward, enabling new capabilities warrants human review.

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