The control socket is now the only way the web interface sends the display a
command. The display stops reading display_on_demand_request and
plugin_error_clear_request, and the web interface stops writing them.
- Display: no mailbox poll (MailboxWatch, the 1 s / 0.25 s cadence,
_consume_on_demand_request, the deprecation log) and no persisted
display_on_demand_processed_id guard; the error publisher reads no clear
request. CacheManager.file_signature and MailboxWatch are removed.
- A write to either retired key is dropped by CacheManager.save_cache and
logged once per writer, naming the plugin from the call stack (or the
request's plugin_id), with the API to move to.
- Web: on-demand start with no display listening starts the service (when
start_service) and sends the request again once the socket answers (45 s,
10 s for a running service without a socket yet); every other failure is
a 503 (400 for invalid_args). Stop answers 503 when no display listens,
unless stop_service. errors/clear answers 503 with a reason-specific
message instead of writing a request; clear_pending is always false.
src.ipc.client.should_fall_back is replaced by display_not_listening.
- Kept: display_current_state, display_on_demand_state,
plugin_runtime_snapshot and the heartbeat (read whenever the socket cannot
answer), and display_on_demand_config (the display's resume record).
Tests: mailbox-only tests removed (test_on_demand_mailbox.py, the mailbox
cadence, file_signature and MailboxWatch tests); tests that injected
requests through the mailbox now use the socket queue or a plugin's
in-process request. The run-loop harness sends on-demand requests over its
fake control socket, so four golden traces change: on-demand starts and
stops land at the request instant instead of the next 0.25 s mailbox look
(one frame fewer on the screen they end), and in vegas.json within one
frame instead of 263 ms, which shifts the later 1 s-throttled WiFi-notice
check by under a second.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Control socket stage 2: the render thread wakes for queued commands (static screens ~1 ms, Vegas within one frame), brightness.set, and plugin.reload after a store update, with mailbox/restart fallbacks. Rig checks listed in the PR body are still to run.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
