refactor(streamer): consume control and body over NATS

README.md

@@ -7,7 +7,8 @@ A standalone C++ downstream project that reads frames from cv-mmap IPC, encodes
 This project consumes video frames from the cv-mmap shared memory interface and publishes them as encoded streams. It operates as a downstream consumer only, never writing to the cv-mmap shared memory.
 
 **Key Features:**
-- Reads cv-mmap IPC frames via POSIX shared memory + ZeroMQ synchronization
+- Reads cv-mmap IPC frames via POSIX shared memory + ZeroMQ frame sync
+- Consumes cv-mmap control/status/body over NATS
 - NVENC H.264/H.265 encoding with deterministic software fallback
 - RTP UDP-unicast publisher with automatic SDP generation
 - RTMP publisher with dual H.265 modes (Enhanced-RTMP + domestic extension)
@@ -22,6 +23,7 @@ This project consumes video frames from the cv-mmap shared memory interface and
 - CMake 3.20+
 - GStreamer 1.20+ with development headers
 - ZeroMQ (cppzmq) with development headers
+- NATS server reachable at runtime
 - spdlog
 - NVIDIA GPU with NVENC support (optional, falls back to software encoding)
 
@@ -156,7 +158,8 @@ Run the fault injection and latency validation suite.
 | Flag | Description | Default |
 |------|-------------|---------|
 | `--shm-name NAME` | POSIX shared memory segment name | required |
-| `--zmq-endpoint URI` | ZeroMQ PUB endpoint for sync/status | required |
+| `--zmq-endpoint URI` | ZeroMQ PUB endpoint for frame sync | required |
+| `--nats-url URL` | NATS server for control/status/body | `nats://localhost:4222` |
 | `--queue-size N` | Ingest queue capacity (1 = latest-frame) | 1 |
 
 ### Codec Options