- rename skill and directory to switching-org (gerund convention)
- rewrite description to follow "Use this skill when..." pattern
- add compatibility and metadata frontmatter fields
- rename ## Usage to ## When to Use This Skill
- consolidate Behavior, Steps, and Canonical Examples into single ## Steps section
- remove Purpose section (duplicated description)
- remove .sf/config.json implementation detail
- fix escaped \# in documentation URL
- rephrase --local/--scope note for clarity
