feat: live status-board comment + full-fleet dogfood (#1)

Phase 3: one consolidated, live-updating PR comment aggregating every
model's per-lens progress (queued -> running -> finished + verdict), so
the swarm's progress is visible at a glance and a watcher can tell when
it's done. Opt-in statusWriter in the binary (atomic writes) + a
background status-board.sh renderer wired through entrypoint.sh; default
on, GADFLY_STATUS_BOARD=0 to disable.

Also restores gadfly's dogfood swarm to the full cloud fleet (9 cloud +
M5; M1 dropped as too slow) matching mort, and folds in the 3 real bugs
the swarm found on its own PR (skip-binary stuck-waiting, panic-stuck
lens, busy-loop on bad poll interval). All 36 findings graded via the
gadfly MCP (18 real / 18 false-positive).

gofmt clean, go vet quiet, go build + go test -race green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: Steve Dudenhoeffer <steve@stevedudenhoeffer.com>
Co-committed-by: Steve Dudenhoeffer <steve@stevedudenhoeffer.com>

examples/adversarial-review.yml

@@ -65,6 +65,10 @@ jobs:
           #   GADFLY_PROVIDER_LENS_CONCURRENCY: "ollama-cloud=3,m1=1"
           # GADFLY_LENS_CONCURRENCY: ${{ vars.GADFLY_LENS_CONCURRENCY }}
           # GADFLY_PROVIDER_LENS_CONCURRENCY: ${{ vars.GADFLY_PROVIDER_LENS_CONCURRENCY }}
+          # Live status board (optional; ON by default): one consolidated comment
+          # showing every model's per-lens progress as it runs. Disable with
+          # GADFLY_STATUS_BOARD=0; tune the refresh with GADFLY_STATUS_POLL_SECS.
+          # GADFLY_STATUS_BOARD: ${{ vars.GADFLY_STATUS_BOARD }}
           # --- Models & providers (optional; default = Ollama Cloud) ----------
           # Gadfly is majordomo-powered, so it can target other backends. Set a
           # provider for bare model ids; point at a different endpoint with a