proto: model DashcamSei.SeiMetadata (TeslaCam/Sentry video SEI telemetry) - #19
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…try) Adds a new no-upstream proto/dashcam module for the per-frame vehicle telemetry (speed, gear, steering, GPS, heading, acceleration, autopilot state, blinkers, brake) carried in the SEI metadata embedded in TeslaCam, Sentry, and live-camera H.264 video, along with a changeset for lockstep npm/PyPI publish.
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Removed comments regarding telemetry source and provenance.
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Intent
DashcamSei.SeiMetadata: the per-frame vehicle telemetry (speed, gear, steering angle, GPS position/heading, linear acceleration, autopilot state, blinkers, brake) carried in the SEI (supplemental enhancement information) payload embedded in TeslaCam/Sentry/live-camera H.264 video. This is a third consumption path alongside BLE and the Fleet API - the data is embedded directly in the video stream/file rather than sent over a command/telemetry channel - and it's the schema a third-party dashcam/Sentry-clip viewer needs to decode the overlay track synced to the footage.proto/dashcam/, following the same "Teslemetry source-of-record" pattern asproto/teslapower/: registered inbuf.yaml,scripts/generate.sh'sGROUPS_LIST, and the layout/provenance tables inREADME.md/PROVENANCE.md.uint32) has no recoverable name; kept asfield_1with a comment on what's known (a schema/frame-type version byte) rather than guessing.buf lintand the upstream coverage gate are green (no upstream repo covers this namespace, so nothing to checkbuf breakingagainst for a new module).