[FEATURE] Support $ prefix for skill picker + multi-skill text invocation

[opcan]

Currently in OpenCode:

• /command works only in main chat (has issues with some commands)
• $skill doesn't trigger picker like in Claude Code
• Users can't combine multiple skills in one text like 'use $skill1 then $skill2'

Requested features:

1. $ prefix support - Make '$' trigger the skill picker anywhere in text (like Claude Code does). Writing "Use $sreality-reporting" should invoke the skill picker or use that skill.

2. Multi-skill invocation - Allow combining skills in one prompt: "Use $skill1 for X, then continue with $skill2 for Y"

3. Slash command fix - The picker doesn't work well with '/' prefix in some cases (e.g., /sreality-reporting returns 'failed to send command')

Why this matters:

• Users can't remember all skill names - picker helps with discovery
• This would make workflow automation much faster
• Matches Claude Code behavior which users expect

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Created via OpenCode skill

[github-actions]

This issue doesn't fully meet our contributing guidelines.

What needs to be fixed:

• Missing the required verification checkbox from the Feature Request template (e.g., confirming you have searched existing issues before submitting)
• Title should use [FEATURE]: (with colon) to match the expected format

Please edit this issue to address the above within 2 hours, or it will be automatically closed.

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This issue might be a duplicate of existing issues. Please check:

• /review command doesn't work well. #18866: /review slash command fails with a tool error — overlaps with the slash command fix described in point 3
• Custom commands are not working (can't see them) #18987: Custom commands/skills not visible in the picker at all — same discoverability gap as points 1 and 3
• [Feature Request] Add custom commands to ctrl+p command list #19069: Feature request to surface custom commands via a picker (ctrl+p) — same discoverability motivation as the $ prefix picker request

The $ prefix trigger and multi-skill invocation features appear to be genuinely new, so those sub-features are not duplicated.

If you believe this was flagged incorrectly, please let a maintainer know.

[github-actions]

This issue has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

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