test(e2e): Playwright tier asserts altitude lock + matching morph (in & out)

Task 8. New simulator/e2e Playwright tier (§9 browser tier). altitude-lock.spec
proves: zooming plays the morph matching the landed clip (forward + .rev), and
the clip is LOCKED after landing (no change while parked). advance() records
played morph paths on window.__hefMorphs (diagnostic seam; reliable under the
blob cache).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

simulator/static/app.js

@@ -641,6 +641,9 @@ async function advance(delta) {
     // a slow spin plays each at 1x. Each morph already ends on its destination
     // clip's frame, so there is NO secondary swap.
     for (const step of move.steps) {
+      // Diagnostic seam: record the logical morph path played (the resolved URL may
+      // be an in-memory blob, so this is the reliable record for Dev Mode + E2E).
+      (window.__hefMorphs || (window.__hefMorphs = [])).push(step.file);
       await playTransition(step.file, step.blended);
     }
     ringIndex = move.to_index;