Update documentation and Dockerfile for Homebrew installation; fix version in config.yaml to 0.5.35

DOCS.md

@@ -153,14 +153,21 @@ This allows using the Control UI over LAN HTTP.
 This add-on keeps options minimal but practical. See `openclaw_assistant_dev/config.yaml` for the full schema.
 
 ### Gateway Network Settings
-Control how the OpenClaw gateway binds to the network:
+Control how the OpenClaw gateway operates and binds to the network:
+
+- **`gateway_mode`** (string: **local** or **remote**, default **local**)
+  - **local**: Run the gateway locally in this add-on (recommended for most users)
+  - **remote**: Connect to a remote gateway running elsewhere
+  - This setting determines whether OpenClaw runs its own gateway or connects to an existing one
 
 - **`gateway_bind_mode`** (string: **loopback** or **lan**, default **loopback**)
   - **loopback**: Bind to 127.0.0.1 only — secure, local access only
   - **lan**: Bind to all interfaces — accessible from your local network
+  - Only applies when `gateway_mode` is **local**
 
 - **`gateway_port`** (int, default **18789**)
   - Port number for the gateway to listen on
+  - Only applies when `gateway_mode` is **local**
 
 - **`allow_insecure_auth`** (bool, default **false**)
   - Allow HTTP authentication for gateway access on LAN
@@ -204,6 +211,23 @@ How to provide the key:
 
 ## Troubleshooting
 
+### Some skills fail to install (Homebrew errors)
+
+If you see errors like:
+- `Homebrew's x86_64 support on Linux requires a CPU with SSSE3 support!`
+- `spawn brew ENOENT` or `brew: command not found`
+
+**Cause**: Your CPU doesn't support SSSE3 instructions (required by Homebrew). This affects older CPUs like some Intel Atom, Celeron, or pre-2006 processors.
+
+**Impact**: Skills that depend on CLI tools installed via Homebrew (e.g., `gemini`, `aider`) won't install. Core OpenClaw functionality still works.
+
+**Solutions**:
+1. **Use a newer CPU** with SSSE3 support (Intel Core 2 or newer, ~2006+)
+2. **Install dependencies manually** if you know which tools are needed
+3. **Use alternative skills** that don't require Homebrew dependencies
+
+The add-on will still start and work - Homebrew is optional.
+
 ### I get ERR_CONNECTION_REFUSED
 - The gateway is not reachable at that IP/port.
 - Confirm bind/port in terminal: