Narrow re-introduction of the power-save mode: when carState reports
gearShifter == park, serve the last rendered model_output instead of
running GPU inference. First cycle (or before carState is flowing)
still runs one real inference so we have something to cache and serve.
Out-of-park returns to per-frame inference immediately.
Avoids the pitfall of the earlier variable-rate path: this doesn't
change the publish rate on modelV2/cameraOdometry (we still publish
every frame), so downstream freq_ok / valid checks in calibrationd /
locationd / paramsd stay happy. Only the GPU inference is skipped.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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