feat(darwin): run Frigate ANE object detector as a launchd agent on dungeon

nixos/docs/darwin-post-deploy.md

@@ -24,6 +24,15 @@ Run these tasks after initial deployment on a new Mac.
 - [ ] Clone notes repo: `git clone git@github.com:<user>/notes.git ~/Notes`
 - [ ] Clone other personal repos as needed
 
+## Frigate ANE Detector (dungeon only)
+The `frigate-detector` launchd agent (hosts/macs/dungeon/default.nix) runs the native
+Apple-Silicon object detector that Frigate connects to over ZMQ. It is not auto-cloned:
+- [ ] `git clone https://github.com/frigate-nvr/apple-silicon-detector ~/Git/apple-silicon-detector`
+- [ ] `cd ~/Git/apple-silicon-detector && /opt/homebrew/bin/python3.11 -m venv venv`
+- [ ] `./venv/bin/pip3 install -r requirements.txt`
+- [ ] Re-run `darwin-rebuild switch` so the agent finds the venv, then verify:
+      `tail ~/Library/Logs/frigate-detector.log` shows "ZMQ server successfully bound to tcp://*:5555"
+
 ## Launch Applications
 
 - [ ] Set up AeroSpace tiling

nixos/hosts/macs/dungeon/default.nix

@@ -346,4 +346,31 @@
       StandardErrorPath = "/Users/${vars.user.name}/Library/Logs/mac-battery-textfile.log";
     };
   };
+
+  # ---------------------------------------------------------------------------
+  # Frigate object detection on the Apple Neural Engine.
+  # Frigate runs in OrbStack's Linux VM, which can't reach the ANE — so the
+  # detector (frigate-nvr/apple-silicon-detector) runs NATIVELY here and Frigate
+  # connects from the container over ZMQ/TCP (config: detectors.type=zmq,
+  # endpoint=tcp://host.docker.internal:5555). This moves the single biggest
+  # CPU consumer (CPU inference was ~64% of Frigate's load) onto the Neural
+  # Engine. Run in AUTO mode: Frigate ships the yolov9 model over ZMQ on connect.
+  # Manual one-time install (not auto-cloned — see darwin-post-deploy.md):
+  #   git clone https://github.com/frigate-nvr/apple-silicon-detector ~/Git/apple-silicon-detector
+  #   cd ~/Git/apple-silicon-detector && /opt/homebrew/bin/python3.11 -m venv venv
+  #   ./venv/bin/pip3 install -r requirements.txt
+  launchd.user.agents.frigate-detector = {
+    serviceConfig = {
+      ProgramArguments = [
+        "/Users/${vars.user.name}/Git/apple-silicon-detector/venv/bin/python3"
+        "-u"
+        "/Users/${vars.user.name}/Git/apple-silicon-detector/detector/zmq_onnx_client.py"
+      ];
+      WorkingDirectory = "/Users/${vars.user.name}/Git/apple-silicon-detector";
+      RunAtLoad = true;
+      KeepAlive = true;
+      StandardOutPath = "/Users/${vars.user.name}/Library/Logs/frigate-detector.log";
+      StandardErrorPath = "/Users/${vars.user.name}/Library/Logs/frigate-detector.log";
+    };
+  };
 }