fix(director): reconcile only stale layers on same-shot seeks

Compare declared visibility with the manager's effective intent, and treat
in-flight transitions as stale so a toggle or superseded LOAD rollback that
is still settling cannot slip past the check. Reconcile only those layers
inside the lightweight seek instead of rebuilding the shot, and report a
refusal without resetting the seek position or camera.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/director/interactions/interactions.test.mjs

@@ -188,7 +188,7 @@ test('settled pack shots cannot take the same-shot seek shortcut after Stop rele
     _claimCameraOwnership: () =>
       assert.fail('Must reload the released pack before camera seek'),
   });
-  assert.equal(director._seekLoadedShot({ id: 'scene' }, { shot }), false);
+  assert.equal(await director._seekLoadedShot({ id: 'scene' }, { shot }), null);
 });
 
 test('actions preserve camera refusal, layer admission signal and explicit transition cap', async () => {