feat: add skills command group for use with LLMs

[mcncl]

Description

Adds a command set for skill to enable adding Buildkite relevant skills to an LLM config

Changes

• adds a skill command set with add, update and delete options

Usage

# Install a skill locally (current dir)
bk skill add buildkite-cli

# Install globally; will look for ~/.cursor, ~/.claude, or both
bk skill add buildkite-cli --global

# Install to non-Claude/Cursor
bk skill add buildkite-cli --[path/to/location] ~/.pi/agents/skills

Testing

• Tests have run locally (with go test ./...)
• Code is formatted (with go fmt ./...)

[graphite-app]

The error message hardcodes defaultRepo but should use the actual repository that was specified. When a user provides a custom repo via the --repo flag, and the skill is not found, the error message will incorrectly reference github.com/buildkite/skills instead of the actual repository used.

// extractSkill needs to accept the repo parameter
func extractSkill(archive, skillName, dest, repo string) error {
    // ...
    if !found {
        return fmt.Errorf("skill %q not found in github.com/%s", skillName, repo)
    }
    return nil
}

Then update the call sites (lines 313, etc.) to pass the repo parameter through the call chain.

Spotted by Graphite



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[mcncl]

We only want to use the buildkite/skills repo