Docs: Added K3s deployment README

k3s/README.md

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+# PicoClaw K3s Deployment
+
+This directory contains the Kubernetes manifests for deploying the PicoClaw agent on a K3s cluster. The deployment is hardened with workspace isolation and secure secret management.
+
+## 📁 Manifests
+
+- **[deployment.yaml](deployment.yaml)**: Defines the PicoClaw agent deployment, including an init container for configuration syncing and volume mounts for secrets and persistent storage.
+- **[configmap.yaml](configmap.yaml)**: The main agent configuration (Syncs to `config.json`).
+- **[secrets.yaml](secrets.yaml)**: Template for sensitive API keys (Telegram, NVIDIA, Azure, etc.).
+- **[pvc.yaml](pvc.yaml)**: Persistent Volume Claim for agent workspaces and chat history.
+- **[service.yaml](service.yaml)**: Internal service for MCP server communication.
+
+## 🚀 Deployment Steps
+
+### 1. Configure Secrets
+Open **[secrets.yaml](secrets.yaml)** and replace the placeholders with your actual API keys. Then apply it to your cluster:
+
+```bash
+kubectl apply -f secrets.yaml
+```
+
+### 2. Prepare Storage
+Ensure your K3s cluster has a default storage class or configure the **[pvc.yaml](pvc.yaml)** to match your storage provider:
+
+```bash
+kubectl apply -f pvc.yaml
+```
+
+### 3. Deploy the Agent
+Apply the configuration and the deployment:
+
+```bash
+kubectl apply -f configmap.yaml
+kubectl apply -f deployment.yaml
+kubectl apply -f service.yaml
+```
+
+## 🔒 Security Features
+
+### Workspace Isolation
+The agent is configured to restrict all filesystem tools to its respective workspace. The `deployment.yaml` ensures the correct directory structure is initialized before the agent starts.
+
+### Secret Management
+API keys are never stored in the `ConfigMap`. Instead, they are mounted as files from a Kubernetes Secret into `/etc/picoclaw/secrets/`. The agent reads these using the `file://` scheme:
+
+```json
+"token": "file:///etc/picoclaw/secrets/telegram-token"
+```
+
+### Safe Command Execution
+Standard high-risk shell commands are blocked by the `exec` tool's safety guard. Targeted relaxations (e.g., for `git push`) are explicitly added to `custom_allow_patterns` in `configmap.yaml`.
+
+## 🛠️ Management
+
+### Logs
+To view the agent logs:
+```bash
+kubectl logs -f deployment/picoclaw-agent
+```
+
+### Updating Configuration
+1. Modify **[configmap.yaml](configmap.yaml)**.
+2. Apply the change: `kubectl apply -f configmap.yaml`.
+3. Restart the pod: `kubectl rollout restart deployment/picoclaw-agent`.