A2UI: share web UI and action bridge

apps/shared/ClawdisKit/Tests/ClawdisKitTests/CanvasA2UIActionTests.swift

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+import ClawdisKit
+import Foundation
+import Testing
+
+@Suite struct CanvasA2UIActionTests {
+    @Test func sanitizeTagValueIsStable() {
+        #expect(ClawdisCanvasA2UIAction.sanitizeTagValue("Hello World!") == "Hello_World_")
+        #expect(ClawdisCanvasA2UIAction.sanitizeTagValue("  ") == "-")
+        #expect(ClawdisCanvasA2UIAction.sanitizeTagValue("macOS 26.2") == "macOS_26.2")
+    }
+
+    @Test func formatAgentMessageIsTokenEfficientAndUnambiguous() {
+        let msg = ClawdisCanvasA2UIAction.formatAgentMessage(
+            actionName: "Get Weather",
+            sessionKey: "main",
+            surfaceId: "main",
+            sourceComponentId: "btnWeather",
+            host: "Peter’s iPad",
+            instanceId: "ipad16,6",
+            contextJSON: "{\"city\":\"Vienna\"}")
+
+        #expect(msg.contains("CANVAS_A2UI "))
+        #expect(msg.contains("action=Get_Weather"))
+        #expect(msg.contains("session=main"))
+        #expect(msg.contains("surface=main"))
+        #expect(msg.contains("component=btnWeather"))
+        #expect(msg.contains("host=Peter_s_iPad"))
+        #expect(msg.contains("instance=ipad16_6 ctx={\"city\":\"Vienna\"}"))
+        #expect(msg.hasSuffix(" default=update_canvas"))
+    }
+
+    @Test func a2uiBundleSupportsAndroidBridgeFallback() throws {
+        guard let url = ClawdisKitResources.bundle.url(forResource: "a2ui.bundle", withExtension: "js")
+        else {
+            throw NSError(domain: "Tests", code: 1, userInfo: [
+                NSLocalizedDescriptionKey: "Missing resource a2ui.bundle.js",
+            ])
+        }
+        let js = try String(contentsOf: url, encoding: .utf8)
+        #expect(js.contains("clawdisCanvasA2UIAction"))
+        #expect(js.contains("globalThis.clawdisCanvasA2UIAction"))
+    }
+}