fix: agents spec alignment

[EduSantosBrito]

Issue for this PR

Fixes #11972

Related: #20474, #21793

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Supports the Agent Skills disable-model-invocation frontmatter field.

Per https://agentskills.io/client-implementation/adding-skills-support#filtering, skills can include metadata that controls model-facing invocation. When disable-model-invocation: true is present, OpenCode now excludes that skill from the model-facing available skills catalog while keeping the skill loadable by explicit name.

This lets manual/internal skills stay available without spending model context or encouraging automatic model activation.

Also updates the OpenCode skills docs and regenerates the JS SDK type.

How did you verify your code works?

• bun test test/skill/skill.test.ts --timeout 30000
• bun typecheck in packages/opencode
• bun typecheck in packages/sdk/js

Screenshots / recordings

Not applicable. No UI changes.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[dance4rce]

+1
Really needed to get rid of commands at last

[github-actions]

Automated PR Cleanup

Thank you for contributing to opencode.

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[CharlieJ-BGS]

@EduSantosBrito you have 3 positive reactions now. Do you want to try re-opening this PR?

[EduSantosBrito]

I cannot reopen it saddly :/

@rekram1-node Maybe it's worth a reopen?