fix: agent Dockerfile package structure and Dead container crash

- Dockerfile: COPY to /app/agent/ and use agent.main:app for proper
  package imports
- docker_ops: use low-level API in get_health() to avoid NotFound on
  containers stuck in Docker Dead state
- Add comprehensive README with architecture, API docs, and usage

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -1,3 +1,87 @@
-# farm-manager
+# Farm Manager
 
-Web dashboard for managing Docker services across the homelab cluster
+Web dashboard for managing Docker services across the homelab cluster. Provides full control (start/stop/restart/logs/pull) with service grouping for bulk operations.
+
+## Architecture
+
+```
+Browser --> API Server (hf-pdocker-01:8888)
+                |
+         +------+------+
+         |      |      |
+       Agent  Agent  Agent
+     (01:8889)(02:8889)(bart:8889)
+         |      |      |
+      Docker Docker  Docker
+      Socket Socket  Socket
+```
+
+- **API Server** — FastAPI on :8888. Serves the dashboard, proxies commands to node agents, manages service groups.
+- **Node Agent** — FastAPI on :8889 per node. Mounts Docker socket, auto-detects Swarm vs Compose containers.
+- **Dashboard** — Vanilla HTML/CSS/JS. Dark theme, service cards, group management, log viewer.
+
+## Quick Start
+
+```bash
+# Build and push images
+docker build -f agent/Dockerfile -t 127.0.0.1:5050/farm-agent:latest agent/
+docker build -f Dockerfile.server -t 127.0.0.1:5050/farm-manager:latest .
+docker push 127.0.0.1:5050/farm-agent:latest
+docker push 127.0.0.1:5050/farm-manager:latest
+
+# Deploy agent on each node
+cd /mnt/docker-data/compose/{node}/farm-agent && docker compose up -d
+
+# Deploy server on hf-pdocker-01
+cd /mnt/docker-data/compose/hf-pdocker-01/farm-manager && docker compose up -d
+```
+
+## Configuration
+
+`config.json` — Node definitions (name, host, agent_port)
+
+`groups.json` — Service groups for bulk operations (10 default groups included)
+
+Both stored at `/mnt/docker-data/configs/farm-manager/`.
+
+## API
+
+### Server (`:8888`)
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | `/api/nodes` | List nodes with health |
+| GET | `/api/services` | All containers across nodes |
+| POST | `/api/services/{node}/{container}/start` | Start container |
+| POST | `/api/services/{node}/{container}/stop` | Stop container |
+| POST | `/api/services/{node}/{container}/restart` | Restart container |
+| GET | `/api/services/{node}/{container}/logs` | Get logs |
+| POST | `/api/services/{node}/{container}/pull` | Pull image |
+| GET/POST/PUT/DELETE | `/api/groups[/{id}]` | Group CRUD |
+| POST | `/api/groups/{id}/start\|stop\|restart` | Bulk group actions |
+
+### Agent (`:8889`)
+
+| Method | Path | Description |
+|--------|------|-------------|
+| GET | `/health` | Agent health check |
+| GET | `/containers` | List all containers |
+| POST | `/containers/{id}/start\|stop\|restart` | Container actions |
+| GET | `/containers/{id}/logs` | Get logs |
+| POST | `/containers/{id}/pull` | Pull image |
+
+## Testing
+
+```bash
+pip install -r agent/requirements.txt -r server/requirements.txt pytest pytest-asyncio httpx
+pytest -v
+```
+
+52 tests covering agent Docker operations, agent API, server proxy routes, and group CRUD.
+
+## Swarm Handling
+
+The agent auto-detects Swarm containers via the `com.docker.swarm.service.name` label:
+- **Start**: Scales service to 1 replica
+- **Stop**: Scales service to 0 replicas
+- **Restart**: Force-updates the service

agent/Dockerfile

@@ -7,8 +7,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-COPY . .
+COPY . /app/agent/
 
 EXPOSE 8889
 
-CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8889"]
+CMD ["uvicorn", "agent.main:app", "--host", "0.0.0.0", "--port", "8889"]

agent/docker_ops.py

@@ -217,8 +217,12 @@ class DockerOps:
             return {"success": False, "message": str(exc)}
 
     def get_health(self) -> dict:
-        """Return node health info: hostname and container count."""
-        containers = self.client.containers.list(all=True)
+        """Return node health info: hostname and container count.
+
+        Uses the low-level API to avoid NotFound errors from containers
+        stuck in Docker's 'Dead' state.
+        """
+        containers = self.client.api.containers(all=True)
         return {
             "status": "healthy",
             "hostname": socket.gethostname(),