iOS: centralize canvas commands and capabilities

apps/ios/Sources/Bridge/BridgeConnectionController.swift

@@ -155,17 +155,17 @@ final class BridgeConnectionController {
     }
 
     private func currentCaps() -> [String] {
-        var caps = ["canvas"]
+        var caps = [ClawdisCapability.canvas.rawValue]
 
         // Default-on: if the key doesn't exist yet, treat it as enabled.
         let cameraEnabled =
             UserDefaults.standard.object(forKey: "camera.enabled") == nil
                 ? true
                 : UserDefaults.standard.bool(forKey: "camera.enabled")
-        if cameraEnabled { caps.append("camera") }
+        if cameraEnabled { caps.append(ClawdisCapability.camera.rawValue) }
 
         let voiceWakeEnabled = UserDefaults.standard.bool(forKey: VoiceWakePreferences.enabledKey)
-        if voiceWakeEnabled { caps.append("voiceWake") }
+        if voiceWakeEnabled { caps.append(ClawdisCapability.voiceWake.rawValue) }
 
         return caps
     }

apps/ios/Sources/Model/NodeAppModel.swift

@@ -266,12 +266,7 @@ final class NodeAppModel {
 
     private func handleInvoke(_ req: BridgeInvokeRequest) async -> BridgeInvokeResponse {
         // Alias for "canvas" capability: accept canvas.* commands and map them to screen.*.
-        let command =
+        let command = ClawdisInvokeCommandAliases.canonicalizeCanvasToScreen(req.command)
-            if req.command.hasPrefix("canvas.") {
-                "screen." + req.command.dropFirst("canvas.".count)
-            } else {
-                req.command
-            }
 
         if command.hasPrefix("screen.") || command.hasPrefix("camera."), self.isBackgrounded {
             return BridgeInvokeResponse(

apps/ios/Tests/CanvasCommandAliasTests.swift

@@ -0,0 +1,38 @@
+import ClawdisKit
+import Testing
+
+@Suite struct CanvasCommandAliasTests {
+    @Test func mapsKnownCanvasCommandsToScreen() {
+        let mappings: [(ClawdisCanvasCommand, ClawdisScreenCommand)] = [
+            (.show, .show),
+            (.hide, .hide),
+            (.setMode, .setMode),
+            (.navigate, .navigate),
+            (.evalJS, .evalJS),
+            (.snapshot, .snapshot),
+        ]
+
+        for (canvas, screen) in mappings {
+            #expect(
+                ClawdisInvokeCommandAliases.canonicalizeCanvasToScreen(canvas.rawValue) ==
+                    screen.rawValue)
+        }
+    }
+
+    @Test func mapsUnknownCanvasNamespaceToScreen() {
+        #expect(ClawdisInvokeCommandAliases.canonicalizeCanvasToScreen("canvas.foo") == "screen.foo")
+    }
+
+    @Test func leavesNonCanvasCommandsUnchanged() {
+        #expect(
+            ClawdisInvokeCommandAliases.canonicalizeCanvasToScreen(ClawdisCameraCommand.snap.rawValue) ==
+                ClawdisCameraCommand.snap.rawValue)
+    }
+
+    @Test func capabilitiesUseStableStrings() {
+        #expect(ClawdisCapability.canvas.rawValue == "canvas")
+        #expect(ClawdisCapability.camera.rawValue == "camera")
+        #expect(ClawdisCapability.voiceWake.rawValue == "voiceWake")
+    }
+}
+

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
+}