docs: update README with kubeconfig retrieval and Portainer Edge usage

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

CHANGELOG.md

@@ -86,3 +86,4 @@ First release with all 5 design-doc phases complete. ISO boots and runs K8s pods
 - Rewrote dev-vm.sh for macOS: bsdtar ISO extraction, Homebrew mkfs.ext4 detection, direct kernel boot, TCG acceleration, port 8080 forwarding
 - Kubeconfig now served via HTTP on port 8080 (serial console truncates base64 lines)
 - Added 127.0.0.1 and 10.0.2.15 to API server SANs for QEMU port forwarding
+- dev-vm.sh now works on Linux: fallback ISO extraction via isoinfo or loop mount, KVM auto-detection, platform-aware error messages

README.md

@@ -2,7 +2,7 @@
 
 An immutable, bootable Linux distribution purpose-built for [KubeSolo](https://github.com/portainer/kubesolo) — Portainer's ultra-lightweight single-node Kubernetes.
 
-> **Status:** All 5 phases complete. Boots and runs K8s workloads.
+> **Status:** All 5 phases complete. Boots and runs K8s workloads. Portainer Edge Agent tested and connected.
 
 ## What is this?
 
@@ -47,6 +47,24 @@ Or build everything at once inside Docker:
 make docker-build
 ```
 
+After boot, retrieve the kubeconfig and manage your cluster from the host:
+
+```bash
+curl -s http://localhost:8080 > ~/.kube/kubesolo-config
+export KUBECONFIG=~/.kube/kubesolo-config
+kubectl get nodes
+```
+
+### Portainer Edge Agent
+
+Pass Edge credentials via boot parameters:
+
+```bash
+./hack/dev-vm.sh --edge-id=YOUR_EDGE_ID --edge-key=YOUR_EDGE_KEY
+```
+
+Or configure via [cloud-init YAML](cloud-init/examples/portainer-edge.yaml).
+
 ## Requirements
 
 **Build host:**
@@ -189,7 +207,7 @@ Metrics include: `kubesolo_os_info`, `boot_success`, `boot_counter`, `uptime_sec
 | `make build-cross` | Cross-compile for amd64 + arm64 |
 | `make docker-build` | Build everything in Docker |
 | `make quick` | Fast rebuild (re-inject + repack + ISO) |
-| `make dev-vm` | Launch QEMU dev VM |
+| `make dev-vm` | Launch QEMU dev VM (Linux + macOS) |
 | `make test-all` | Run all tests |
 
 ## Documentation