Support mode:autonomous argument for unattended/scheduled runs.
In autonomous mode: skip all user questions, apply safe actions
directly, mark ambiguous cases as stale with conservative confidence,
and generate a detailed report for after-the-fact human review.
Documents five skill design patterns discovered during testing:
platform-agnostic tool references, auto-archive consistency,
smart triage for broad scope, replacement subagents over
ce:compound handoff, and file tools over shell commands.
