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Oleksandr Bezdieniezhnykh
ff790bd639
ci/woodpecker/push/build-arm Pipeline failed
Pins operator-link transport to gRPC server-streaming (closes architecture Q2 in favour of gRPC). Adds first-time tonic / prost / tonic-build infrastructure to the workspace; uses protoc-bin-vendored so neither dev machines nor CI need system protoc installed. Design — back-pressure lives in the per-topic tokio::sync::broadcast ring, drained directly by the tonic-streamed response via BroadcastStream + StreamMap. No intermediate mpsc buffer that could absorb back-pressure invisibly. Slow client overrun -> Lagged(n) event -> per-(client_id, topic) drop counter incremented; healthy clients on the same topic are unaffected. Service surface — Subscribe(SubscribeRequest) -> stream TelemetryMessage; five topics (TelemetrySample, GimbalState, DetectionEvent, MovementCandidate, MapObjectsBundle); empty topics list defaults to subscribe-all; empty client_id rejected; stream drop decrements subscribed_clients via StreamGuard. TelemetrySink push_detections is now real; push_frame still NotImplemented(AZ-676 video path). Tests — 6 unit + 5 integration (AC-1..AC-3 via in-process gRPC client, plus subscribe-all default + empty-client_id rejection). Clippy on telemetry_stream clean. Pre-existing mission_executor ac3 test polling race surfaces more reliably under the new tonic build pressure; documented as _docs/_process_leftovers/2026-05-20_mission_executor_ac3_flake.md and unchanged by this batch. Co-authored-by: Cursor <cursoragent@cursor.com>