iOS: centralize canvas commands and capabilities

apps/shared/ClawdisKit/Sources/ClawdisKit/CanvasCommands.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+public enum ClawdisCanvasCommand: String, Codable, Sendable {
+    case show = "canvas.show"
+    case hide = "canvas.hide"
+    case setMode = "canvas.setMode"
+    case navigate = "canvas.navigate"
+    case evalJS = "canvas.eval"
+    case snapshot = "canvas.snapshot"
+}
+
+public enum ClawdisInvokeCommandAliases {
+    public static func canonicalizeCanvasToScreen(_ command: String) -> String {
+        if command.hasPrefix(ClawdisCanvasCommand.namespacePrefix) {
+            return ClawdisScreenCommand.namespacePrefix +
+                command.dropFirst(ClawdisCanvasCommand.namespacePrefix.count)
+        }
+        return command
+    }
+}
+
+extension ClawdisCanvasCommand {
+    public static var namespacePrefix: String { "canvas." }
+}
+
+extension ClawdisScreenCommand {
+    public static var namespacePrefix: String { "screen." }
+}

apps/shared/ClawdisKit/Sources/ClawdisKit/Capabilities.swift

@@ -0,0 +1,7 @@
+import Foundation
+
+public enum ClawdisCapability: String, Codable, Sendable {
+    case canvas
+    case camera
+    case voiceWake
+}