Agent Skills: update

Bring this machine current — pull the latest project code and ~/.claude, then run the update script (the project's .claude/update.sh when it has one, ~/.claude/update.sh directly when it doesn't) to update Claude Code, skills, and the CLI tools. A start-of-day habit, and the first thing to try when a tool is missing or a skill behaves like an older version. Use when the user says 'update', 'update my setup', 'pull the latest', 'bring me up to date', or invokes /update.