New top-level `pad install` command that auto-detects AI coding tools and
installs the /pad skill with tool-appropriate frontmatter:
- Claude Code (.claude/skills/) — full frontmatter
- Codex/Cursor/Windsurf (.agents/skills/) — name+description only
- GitHub Copilot (.github/instructions/) — applyTo frontmatter
- Amazon Q (.amazonq/rules/) — no frontmatter
- JetBrains Junie (.junie/guidelines/) — no frontmatter
Supports: pad install, pad install <tool>, pad install --all, --list, --update.
Updates pad init to detect and offer multi-tool installation.
xarmian