Shell: one-shot #example-<id> deep link consumed at startup

src/app/infrastructure/url-hash.test.ts

@@ -1,6 +1,7 @@
 import { describe, it, expect, beforeEach } from 'vitest';
 import {
   parseHash,
+  parseExampleHash,
   serializeHash,
   readView,
   replaceView,
@@ -75,6 +76,24 @@ describe('parseHash', () => {
   });
 });
 
+describe('parseExampleHash', () => {
+  it('extracts the example id from the one-shot action link', () => {
+    expect(parseExampleHash('#example-brush')).toBe('brush');
+    expect(parseExampleHash('example-bar')).toBe('bar'); // leading "#" optional
+  });
+
+  it('returns null for anything that is not an example link', () => {
+    expect(parseExampleHash('')).toBeNull();
+    expect(parseExampleHash('#example-')).toBeNull(); // empty id
+    expect(parseExampleHash('#snippet-abc')).toBeNull();
+    expect(parseExampleHash('#build')).toBeNull();
+  });
+
+  it('is not a ViewState: parseHash degrades an example link to the default view', () => {
+    expect(parseHash('#example-brush')).toEqual({ kind: 'snippets' });
+  });
+});
+
 describe('round-trip identity', () => {
   it('parseHash(serializeHash(v)) deep-equals v for every variant', () => {
     for (const v of ALL_VIEWS) {