Add OpenCode skill discovery

[dbalders]

Summary

• Skills were not being auto populated from OpenCode like they were from Codex. So, when running opencode only, you couldn't see any skills with $. This fixes that.
• Load OpenCode SDK app.skills() data as part of provider inventory.
• Map OpenCode skill metadata into the existing provider skills snapshot used by composer $skill suggestions.
• Add a regression test for OpenCode-provided skill rows and malformed rows without locations.

Before:

After:

Note

Add OpenCode skill discovery to the OpenCode provider snapshot

• Extends OpenCodeInventory in opencodeRuntime.ts with a new OpenCodeSkill interface and fetches skills from app.skills concurrently with providers and agents.
• Transforms inventory skills into ServerProviderSkill entries via a new flattenOpenCodeSkills helper, skipping entries missing a name or location, setting enabled=true, and sorting by name.
• Includes the resulting skills array in the ServerProviderDraft produced by checkOpenCodeProviderStatus.

^{Macroscope summarized e31fe8b.}

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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