re-arrange

container-runtime/CLAUDE.md

@@ -0,0 +1,32 @@
+# Container Runtime — Node.js Service Manager
+
+Node.js runtime that manages service containers via JSON-RPC. See `RPCSpec.md` in this directory for the full RPC protocol.
+
+## Architecture
+
+```
+LXC Container (uniform base for all services)
+└── systemd
+    └── container-runtime.service
+        └── Loads /usr/lib/startos/package/index.js (from s9pk javascript.squashfs)
+            └── Package JS launches subcontainers (from images in s9pk)
+```
+
+The container runtime communicates with the host via JSON-RPC over Unix socket. Package JavaScript must export functions conforming to the `ABI` type defined in `sdk/base/lib/types.ts`.
+
+## `/media/startos/` Directory (mounted by host into container)
+
+| Path | Description |
+|------|-------------|
+| `volumes/<name>/` | Package data volumes (id-mapped, persistent) |
+| `assets/` | Read-only assets from s9pk `assets.squashfs` |
+| `images/<name>/` | Container images (squashfs, used for subcontainers) |
+| `images/<name>.env` | Environment variables for image |
+| `images/<name>.json` | Image metadata |
+| `backup/` | Backup mount point (mounted during backup operations) |
+| `rpc/service.sock` | RPC socket (container runtime listens here) |
+| `rpc/host.sock` | Host RPC socket (for effects callbacks to host) |
+
+## S9PK Structure
+
+See `../core/s9pk-structure.md` for the S9PK package format.