Add bundled agent skill command

[kindermax]

Summary by Sourcery

Add experimental lets self skills commands to manage the bundled lets agent skill and document their usage.

New Features:

• Introduce lets self skills subcommands to show, install, and update the bundled lets agent skill, including local/global scopes and custom paths.
• Bundle the lets Agent Skill definition within the binary for installation into standard Agent Skills directories.

Documentation:

• Add an Agent Skills documentation page explaining the bundled lets skill, its installation locations, and usage, and link it from the config reference.
• Update the changelog with notes about the new lets self skills commands and Agent Skills documentation.

Tests:

• Add tests covering lets self skills show, install (local/global), non-destructive installs, and update behaviors.

[sourcery-ai]

Reviewer's Guide

Introduce an experimental lets self skills CLI subcommand for managing the bundled lets Agent Skill, including commands to show, install, and update the skill, along with associated documentation and tests.

File-Level Changes

Change	Details	Files
Add experimental self skills command hierarchy (show/install/update) for managing the bundled lets Agent Skill.	Register a new skills subcommand under lets self and wire it into the existing Cobra command tree. Implement skills show to print the embedded lets skill content to stdout using the skills package. Implement skills install with flags for local/global/path scopes, optional skill name validation, and a prompt-based scope picker when no scope is provided. Implement skills update to scan known local and global skill locations and update installed skills to the bundled version. Introduce helpers for determining local (Git-root) and global (~/.agents/skills) skills directories, prompting for scope, installing/updating the skill file, and finding the Git repository root.	internal/cmd/self.go internal/cmd/self_skills.go
Embed the bundled lets Agent Skill content and constants describing its layout.	Add an embedded internal/skills/lets/SKILL.md file describing how agents should discover and use lets tasks and configuration. Expose constants for the lets skill name, skills directory layout, and skill file name. Provide a LetsSkill accessor that returns a copy of the embedded skill bytes for use by CLI commands.	internal/skills/lets/SKILL.md internal/skills/skills.go
Add tests for the new self skills commands covering show, install, and update behaviors.	Verify self skills show outputs the bundled lets skill content. Test interactive install prompting for local/global scope and writing to the correct directory under a temporary Git repo or HOME. Ensure existing skills are not overwritten without --force and that update rewrites old content and reports status messages. Add helpers to create a temporary Git repo and assert installed skill files match the embedded skill content.	internal/cmd/self_skills_test.go
Document the new Agent Skills feature and link it into existing docs and navigation.	Add an Agent Skills section to the config reference explaining that skills are managed via lets self skills rather than lets.yaml. Create a dedicated Agent Skills doc page describing what gets installed, how to show/install/update/remove the bundled skill, and the supported flags. Update the changelog with entries for the new lets self skills commands and documentation. Register the new Agent Skills doc in the Docusaurus sidebar navigation.	docs/docs/config.md docs/docs/changelog.md docs/docs/agent_skills.md docs/sidebars.js

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[sourcery-ai]

Hey - I've left some high level feedback:

• In skillsInstallOptions.targetDir, prompting for scope fails entirely if localSkillsDir cannot be resolved (e.g., not in a Git repo), even when the user might want a global install; consider making the local path optional in this case so that prompting still works and global-only installs are possible.
• findGitRoot only detects repositories where .git is a directory; for worktrees or non-standard setups where .git is a file, this will fail and break --local installs, so it may be worth extending this helper to handle .git as a file pointing to the actual repo metadata.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `skillsInstallOptions.targetDir`, prompting for scope fails entirely if `localSkillsDir` cannot be resolved (e.g., not in a Git repo), even when the user might want a global install; consider making the local path optional in this case so that prompting still works and global-only installs are possible.
- `findGitRoot` only detects repositories where `.git` is a directory; for worktrees or non-standard setups where `.git` is a file, this will fail and break `--local` installs, so it may be worth extending this helper to handle `.git` as a file pointing to the actual repo metadata.

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