Add Docker Compose fleet config for agent containerization (closes #5)

- docker-compose.yml: Ollama, Gitea, Agent worker, Monitor services
- Dockerfile.agent: Hermes agent worker image with health endpoint
- .env.example: Environment variable template
- README.md: Setup instructions and service documentation

Services include health checks, persistent volumes, isolated network,
and proper dependency ordering.

.env.example

@@ -0,0 +1,28 @@
+# .env.example
+# Environment variables for fleet-ops Docker Compose
+# Copy this file to .env and fill in your values.
+#   cp .env.example .env
+
+# --- Agent ---
+AGENT_NAME=hermes
+AGENT_LOOP_INTERVAL=30
+LOG_LEVEL=info
+
+# --- Ollama ---
+OLLAMA_PORT=11434
+
+# --- Gitea ---
+GITEA_UID=1000
+GITEA_GID=1000
+GITEA_ROOT_URL=http://gitea:3000
+GITEA_DOMAIN=gitea
+GITEA_WEB_PORT=3000
+GITEA_SSH_PORT=2222
+
+# --- Monitor ---
+MONITOR_INTERVAL=60
+
+# --- Agent API Keys (add your own) ---
+# OPENAI_API_KEY=
+# ANTHROPIC_API_KEY=
+# NOSTR_PRIVATE_KEY=