Initial fleet-api skill

SKILL.md

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+---
+name: fleet-api
+description: Machine registry API for fleet management
+metadata:
+  version: "1.0.0"
+  vibestack:
+    main: false
+    requires: []
+---
+
+# Fleet API
+
+Minimal REST API for machine registration and discovery.
+
+## Endpoints
+
+| Method | Endpoint | Description |
+|--------|----------|-------------|
+| POST | `/api/machines/register` | Register/heartbeat a machine |
+| GET | `/api/machines` | List all registered machines |
+| DELETE | `/api/machines/:id` | Unregister a machine |
+
+## Registration Payload
+
+```json
+{
+  "id": "machine-uuid",
+  "name": "dev-machine-1",
+  "url": "http://192.168.1.10:3000",
+  "version": "1.0.0",
+  "skills": ["caddy", "ttyd", "dashboard"],
+  "status": "running"
+}
+```
+
+## Dependencies
+
+Requires `socat` and `jq` to be installed:
+```bash
+apt-get install -y socat jq
+```
+
+## Configuration
+
+- `FLEET_API_PORT` - API server port (default: 3001)
+- `FLEET_DATA_DIR` - Data directory (default: /data/fleet)
+
+## Storage
+
+Machines stored in `machines.json` with `lastSeen` timestamps.
+Machines with `lastSeen` > 60 seconds are marked as `status: unknown`.