test(smoke): clean up live output — sections only, no summary

Drops the MainThread group from the live region (it was redrawing the
entire view on every orchestrator log line, which stacked duplicate
`── MainThread ──` headers when long lines wrapped past the cursor-up
wipe). Inlines per-skill `✓/✗ name detail` lines into each platform's
section as steps complete, matching the old summary format — and
removes the post-run summary block since the same info now lives in
the sections themselves.

Bob's install-only message also corrected: --resume works upstream
again; the real reason we skip skill execution is that bob has no way
to run slash commands non-interactively from a one-shot prompt.

Author: illeatmyhat