tests: replace the stale DSL-not-implemented-yet warn test

The test was written in slice 5 when evalAction for type:'script' was
a warn stub. Slice 8 wired it up to the actual parser, so the original
assertion (1 warning) no longer holds. Replaces it with two tests:
valid DSL source fires the parsed sub-actions without warnings, and
invalid lines surface a warning without blocking the valid ones.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/devtools/tests.ts

@@ -3328,10 +3328,20 @@ export function registerAllTests(): void {
       expect(rt.buttonDisabled.b2).toBe(true)
     })
 
-    test("script action warns that DSL isn't implemented yet", () => {
+    test('script action parses and dispatches sub-actions (no warn on valid DSL)', () => {
       const rt = makeMockRuntime()
-      evalAction({ type: 'script', source: 'play' }, rt)
+      evalAction({ type: 'script', source: 'play\npause' }, rt)
+      expect(rt.warnings.length).toBe(0)
+      expect(rt.calls).toEqual(['play', 'pause'])
+    })
+
+    test('script action warns per invalid DSL line', () => {
+      const rt = makeMockRuntime()
+      evalAction({ type: 'script', source: 'play\nwat\npause' }, rt)
       expect(rt.warnings.length).toBe(1)
+      expect(rt.warnings[0]).toContain('wat')
+      // Valid lines still fire.
+      expect(rt.calls).toEqual(['play', 'pause'])
     })
 
     test('buildMarkerMap maps name → time', () => {