Set up and inventory as an agent

Set up SelfTune locally and inventory the skills available across the supported
agent harnesses and projects on this computer.

Inspect the existing runtime first. Reuse a healthy installation instead of
installing another copy. Before installing hooks, importing history, enabling a
background service, connecting an account, or changing any skill, explain the
exact consequence and ask for separate approval.

Do not upload data, publish a skill, change credentials, enable billing, delete
packages, consolidate duplicates, or apply a Skill Set during setup.

Return the SelfTune version, connected harnesses, discovered skill locations,
identical duplicates, conflicting revisions, protected packages, and actions
that still need my decision.