feat: Support installing built-in AGENT files and skills during picoclaw onboard

Dockerfile

@@ -25,12 +25,8 @@ RUN apk add --no-cache ca-certificates tzdata
 # Copy binary
 COPY --from=builder /src/build/picoclaw /usr/local/bin/picoclaw
 
-# Copy builtin skills
-COPY --from=builder /src/skills /opt/picoclaw/skills
-
 # Create picoclaw home directory
-RUN mkdir -p /root/.picoclaw/workspace/skills && \
-    cp -r /opt/picoclaw/skills/* /root/.picoclaw/workspace/skills/ 2>/dev/null || true
+RUN /usr/local/bin/picoclaw onboard
 
 ENTRYPOINT ["picoclaw"]
 CMD ["gateway"]