Move discovery, interview, archetype detection, audit pipeline, and
validation gates from the onboarder agent into the /onboard skill as
a 9-STEP orchestrator (STEP 0 plugin-check → STEP 9 sequenced backlog).
The onboarder agent becomes a pure config generator: takes a prepared
brief, writes CLAUDE.md / settings.json / .claudeignore / tasks/ scaffold.
No more interview or filesystem scanning in the agent.
Agent shrinks 263 → 86 lines; skill grows 15 → 847 lines.
Co-Authored-By: Claude <noreply@anthropic.com>
