ci: mount windy-pro's read-only build inputs into dind; allow exactly that path for jobs

Non-secret inputs git-ignored in windy-pro (models, linux-x64 portable
bundle, enter-monitor build) that build-desktop needs. Mounted :ro into
dind; valid_volumes allows only /ci-inputs/windy-pro; refresh-ci-inputs.sh
copies them from the frozen release clone (read-only on the source).
Invariant I-5 narrowed, not dropped: exactly that one path, read-only in
dind, no other service mounts it, still no docker socket (proven to fail
on :rw). Orchestrator-approved (option a). Applied in an idle window.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/runner/docker-compose.yml

@@ -49,6 +49,11 @@ services:
       # A fresh volume: Sysbox shifts ownership to its own uid range. The old
       # `dind-storage` is kept untouched for the privileged rollback.
       - dind-storage-sysbox:/var/lib/docker
+      # READ-ONLY, non-secret build inputs for windy-pro's desktop jobs (models,
+      # linux-x64 portable bundle, enter-monitor build), copied from the frozen
+      # release clone by deploy/runner/refresh-ci-inputs.sh. Jobs may mount ONLY
+      # this path (config.yaml valid_volumes). Orchestrator-approved 09-23.
+      - /home/user1-gpu/ci-inputs/windy-pro:/ci-inputs/windy-pro:ro
     # G1.5 — bounded so a fork-bomb workflow cannot starve Grant's interactive
     # session. Veron 1 is his workstation, not a dedicated build box.
     cpus: 12.0            # 12 of 24 cores