refactor: keep minimal spec, add simple samples to basic catalog

Restore the 'minimal' catalog and examples in the specification (reverting
their deletion).

Add equivalent simple examples to the 'basic' catalog examples (prefixed with
00_) in v0.8, v0.9, and v0.10 to serve as simple entry points for the basic catalog.
Rename the simple login form example to '00_simple-login-form.json' to avoid
name collisions with the original basic login form.

Re-add the simple tests in Angular as basic '00_' tests, loading from the basic catalog,
proving that renderers can load these simple examples seamlessly from the basic catalog.

TAG=agy
CONV=9137c307-af0d-4380-8e89-52054dd1fcb0

Author: josemontespg

renderers/angular/a2ui_explorer/src/app/tests/v0_8/00_complex-layout.spec.ts

@@ -0,0 +1,31 @@
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Version, getCanvas, loadExample} from '../utils/test_utils';
+
+describe('Example: Complex Layout (v0.8)', () => {
+  let textContent: string;
+
+  beforeEach(async () => {
+    await loadExample('Complex Layout', Version.V0_8);
+    textContent = getCanvas().textContent;
+  });
+
+  it('should render expected text content', async () => {
+    expect(textContent).toContain('User Profile Form');
+    expect(textContent).toContain('Please fill out all fields.');
+  });
+});

renderers/angular/a2ui_explorer/src/app/tests/v0_8/00_interactive-button.spec.ts

@@ -0,0 +1,52 @@
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {ComponentFixture} from '@angular/core/testing';
+import {DemoComponent} from '../../demo.component';
+import {Version, getCanvas, loadExample, wait} from '../utils/test_utils';
+
+describe('Example: Interactive Button (v0.8)', () => {
+  let textContent: string;
+  let fixture: ComponentFixture<DemoComponent>;
+
+  beforeEach(async () => {
+    fixture = await loadExample('Interactive Button', Version.V0_8);
+    textContent = getCanvas().textContent;
+  });
+
+  it('should render expected text content', async () => {
+    expect(textContent).toContain('Click the button below');
+    expect(textContent).toContain('Click Me');
+  });
+
+  it('should dispatch button_clicked action on button click', async () => {
+    const component = fixture.componentInstance;
+
+    const buttons = fixture.nativeElement.querySelectorAll('a2ui-button button');
+    expect(buttons.length).toBeGreaterThan(0);
+    const btn = buttons[0];
+    expect(btn).toBeTruthy();
+
+    btn.click();
+    fixture.detectChanges();
+
+    await wait(10);
+
+    expect(component.eventsLog.length).toBeGreaterThan(0);
+    const loggedAction = component.eventsLog[0].action;
+    expect(loggedAction.name).toBe('button_clicked');
+  });
+});

renderers/angular/a2ui_explorer/src/app/tests/v0_8/00_row-layout.spec.ts

@@ -0,0 +1,31 @@
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Version, getCanvas, loadExample} from '../utils/test_utils';
+
+describe('Example: Row Layout (v0.8)', () => {
+  let textContent: string;
+
+  beforeEach(async () => {
+    await loadExample('Row Layout', Version.V0_8);
+    textContent = getCanvas().textContent;
+  });
+
+  it('should render expected text content', async () => {
+    expect(textContent).toContain('Left Content');
+    expect(textContent).toContain('Right Content');
+  });
+});

renderers/angular/a2ui_explorer/src/app/tests/v0_8/00_simple-login-form.spec.ts

@@ -0,0 +1,67 @@
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {ComponentFixture} from '@angular/core/testing';
+import {DemoComponent} from '../../demo.component';
+import {Version, getCanvas, loadExample, wait} from '../utils/test_utils';
+
+describe('Example: Simple Login Form (v0.8)', () => {
+  let textContent: string;
+  let fixture: ComponentFixture<DemoComponent>;
+
+  beforeEach(async () => {
+    fixture = await loadExample('Simple Login Form', Version.V0_8);
+    textContent = getCanvas().textContent;
+  });
+
+  it('should render expected text content', async () => {
+    expect(textContent).toContain('Login');
+    expect(textContent).toContain('Sign In');
+  });
+
+  it('should dispatch login_submitted action with the form contents on button click', async () => {
+    const component = fixture.componentInstance;
+
+    const inputs = fixture.nativeElement.querySelectorAll('input');
+    expect(inputs.length).toBeGreaterThanOrEqual(2);
+
+    inputs[0].value = 'testuser';
+    inputs[0].dispatchEvent(new Event('input'));
+
+    inputs[1].value = 'testpass';
+    inputs[1].dispatchEvent(new Event('input'));
+
+    fixture.detectChanges();
+
+    const buttons = fixture.nativeElement.querySelectorAll('a2ui-button button');
+    expect(buttons.length).toBeGreaterThan(0);
+    const btn = buttons[0];
+    expect(btn).toBeTruthy();
+
+    btn.click();
+    fixture.detectChanges();
+
+    await wait(10);
+
+    expect(component.eventsLog.length).toBeGreaterThan(0);
+    const loggedAction = component.eventsLog[0].action;
+    expect(loggedAction.name).toBe('login_submitted');
+    expect(loggedAction.context).toEqual({
+      user: 'testuser',
+      pass: 'testpass',
+    });
+  });
+});

renderers/angular/a2ui_explorer/src/app/tests/v0_8/00_simple-text.spec.ts

@@ -0,0 +1,30 @@
+/**
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import {Version, getCanvas, loadExample} from '../utils/test_utils';
+
+describe('Example: Simple Text (v0.8)', () => {
+  let textContent: string;
+
+  beforeEach(async () => {
+    await loadExample('Simple Text', Version.V0_8);
+    textContent = getCanvas().textContent;
+  });
+
+  it('should render expected text content', async () => {
+    expect(textContent).toContain('Hello, Minimal Catalog!');
+  });
+});

specification/v0_10/catalogs/basic/examples/00_capitalized-text.json

@@ -0,0 +1,58 @@
+{
+  "name": "Capitalized Text",
+  "description": "Simple example demonstrating basic catalog components.",
+  "messages": [
+    {
+      "version": "v0.10",
+      "createSurface": {
+        "surfaceId": "gallery-capitalized-text",
+        "catalogId": "https://a2ui.org/specification/v0_10/catalogs/basic/catalog.json",
+        "sendDataModel": true
+      }
+    },
+    {
+      "version": "v0.10",
+      "updateComponents": {
+        "surfaceId": "gallery-capitalized-text",
+        "components": [
+          {
+            "id": "root",
+            "component": "Column",
+            "children": ["input_field", "result_label", "result_text"],
+            "justify": "start",
+            "align": "stretch"
+          },
+          {
+            "id": "input_field",
+            "component": "TextField",
+            "label": "Type something in lowercase:",
+            "value": {
+              "path": "/inputValue"
+            },
+            "variant": "shortText"
+          },
+          {
+            "id": "result_label",
+            "component": "Text",
+            "text": "Capitalized output:",
+            "variant": "caption"
+          },
+          {
+            "id": "result_text",
+            "component": "Text",
+            "text": {
+              "call": "capitalize",
+              "args": {
+                "value": {
+                  "path": "/inputValue"
+                }
+              },
+              "returnType": "string"
+            },
+            "variant": "h2"
+          }
+        ]
+      }
+    }
+  ]
+}

specification/v0_10/catalogs/basic/examples/00_complex-layout.json

@@ -0,0 +1,65 @@
+{
+  "name": "Complex Layout",
+  "description": "Simple example demonstrating basic catalog components.",
+  "messages": [
+    {
+      "version": "v0.10",
+      "createSurface": {
+        "surfaceId": "gallery-complex-layout",
+        "catalogId": "https://a2ui.org/specification/v0_10/catalogs/basic/catalog.json"
+      }
+    },
+    {
+      "version": "v0.10",
+      "updateComponents": {
+        "surfaceId": "gallery-complex-layout",
+        "components": [
+          {
+            "id": "root",
+            "component": "Column",
+            "children": ["header", "form_row", "footer"],
+            "justify": "spaceBetween",
+            "align": "stretch"
+          },
+          {
+            "id": "header",
+            "component": "Text",
+            "text": "User Profile Form",
+            "variant": "h1"
+          },
+          {
+            "id": "form_row",
+            "component": "Row",
+            "children": ["first_name", "last_name"],
+            "justify": "start",
+            "align": "start"
+          },
+          {
+            "id": "first_name",
+            "component": "TextField",
+            "label": "First Name",
+            "value": {
+              "path": "/firstName"
+            },
+            "weight": 1
+          },
+          {
+            "id": "last_name",
+            "component": "TextField",
+            "label": "Last Name",
+            "value": {
+              "path": "/lastName"
+            },
+            "weight": 1
+          },
+          {
+            "id": "footer",
+            "component": "Text",
+            "text": "Please fill out all fields.",
+            "variant": "caption"
+          }
+        ]
+      }
+    }
+  ]
+}