fix(opencode): include skill files when invoking via slash command

[SakshamKapoor2911]

Closes#24831

Type of change

• Bug fix

What does this PR do?

/skill-name slash commands only injected the skill markdown body as prompt text, without the <skill_files> section that the skill tool provides. This meant referenced files (scripts, reference docs) in the skill directory were not discoverable by the model when using the slash command shortcut.

This fix scans the skill directory for files (excluding SKILL.md, up to 10) and appends a <skill_files> section to the command template, matching the format used by the skill tool (tool/skill.ts). Built-in skills with <built-in> location are unchanged.

Note: PR #35522 addresses the same issue. This implementation uses Glob.scanSync for a synchronous approach that doesn't require the template getter to return a Promise, and uses **/* to include files in subdirectories.

How did you verify your code works?

• Typecheck in packages/opencode passes with no new errors
• Output format matches the <skill_files> layout from tool/skill.ts
• Uses Glob.scanSync so works inside the template getter

Screenshots / recordings

No UI change.

Checklist

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

[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Duplicate PR Found

PR #35522: fix(opencode): include skill files when invoking via slash command

This appears to be a duplicate of the current PR #37044. Both PRs have the identical title and address the same issue—including skill files when invoking via slash commands. PR #35522 likely covers the same bug fix regarding the <skill_files> section injection that the skill tool provides.

[github-actions]

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