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The preview snapshot wrote through a fixed "<snapshot>.tmp". /tmp is world-writable and sticky, and the display service runs as a different user from the tooling, so a leftover temp owned by anyone else became unopenable even by root -- fs.protected_regular refuses O_CREAT on a foreign file in a sticky directory. The preview and the health check's liveness proxy then froze until someone deleted the file by hand; on the test rig that meant 23 hours of a healthy display reporting "hardware: stale". Now uses tempfile.mkstemp with cleanup on failure, matching the hardware-status write a few hundred lines above. Closes #528. _poll_on_demand_requests read its mailbox with max_age=3600, and get() defaults the in-memory TTL to max_age -- so the first request was pinned in memory for an hour and every later poll returned that stale copy. No second on-demand request was honoured until the service restarted, while the API kept returning 200. get() already documents memory_ttl=0 for exactly this cross-process case. The consumed request is also now deleted: leaving it on disk meant a restart replayed the previous request, activated it, and ignored the one the caller had just made. Closes #530. starlark-apps returned None from display() when it has no app to show, which is the state of every install without Pixlet and of a fresh one before any app is added. The controller only skips on a boolean False, so that held a black panel for the full display_duration instead of rotating on. Closes #456 (core side). Verified on the rig: two consecutive on-demand requests with no restart between them are both activated, where the second was previously dropped in silence.