CLI/docs: mention canvas.* alias

docs/ios/spec.md

@@ -123,6 +123,9 @@ These are values for `node.invoke.command`:
 - `screen.snapshot` with `{ maxWidth?, quality?, format? }`
 - `screen.setMode` with `{ mode: "canvas" | "web" }`
 
+Alias:
+- `canvas.*` is accepted as a synonym for `screen.*` (e.g. `canvas.eval` → `screen.eval`).
+
 Result pattern:
 - Request is a standard `req/res` with `ok` / `error`.
 - Long operations (loads, streaming drawing, etc.) may also emit `node.event` progress.

src/cli/nodes-cli.ts

@@ -345,7 +345,10 @@ export function registerNodesCli(program: Command) {
       .command("invoke")
       .description("Invoke a command on a paired node")
       .requiredOption("--node <idOrNameOrIp>", "Node id, name, or IP")
-      .requiredOption("--command <command>", "Command (e.g. screen.eval)")
+      .requiredOption(
+        "--command <command>",
+        "Command (e.g. screen.eval or canvas.eval)",
+      )
       .option("--params <json>", "JSON object string for params", "{}")
       .option(
         "--invoke-timeout <ms>",