fix: fourth review round (mount-failure truth, toggle baking, root ambiguity)

cursor[bot]:
- enqueueEvent dedupes variant_mount_failed per variant, so a second
  broken variant is no longer swallowed while the first is queued.
- Every component (re)injection resets the mount-failure dedupe, so a
  republish that is still broken at the same URL reports again instead
  of silently convincing the agent the repair landed.
- Toggle baking now mirrors preview truth exactly: the runtime sets
  data-p-<id>="on" or removes the attribute, so presence and "on" forms
  survive only while on, and any other valued branch (never matched at
  preview) is dropped in either state.

greptile-apps[bot] (both P1 repros):
- When several apps qualify at the same resolution tier (two live
  servers, or two stopped apps with interrupted sessions), the choice
  stays deterministic but is now loud: a stderr warning names the chosen
  app, the alternatives, and how to target a specific app. Silent
  wrong-app routing was the failure in both repro harnesses.

This work was produced with AI assistance (Claude Code).

Co-Authored-By: Claude Code <noreply@anthropic.com>

tests/live-accept-css.test.mjs

@@ -197,3 +197,15 @@ describe('review regressions: parser boundaries', () => {
     assert.deepEqual([...selectors].sort(), ['.a', '.b', '.c']);
   });
 });
+
+describe('review regressions: toggle branch truth', () => {
+  it('drops valued toggle branches that never matched at preview, keeps on-forms only while on', () => {
+    assert.equal(stripParamSelector('[data-p-flag="false"] .a', 'flag', 'toggle', true), null);
+    assert.equal(stripParamSelector('[data-p-flag="false"] .a', 'flag', 'toggle', false), null);
+    assert.equal(stripParamSelector('[data-p-flag="0"] .a', 'flag', 'toggle', false), null);
+    assert.equal(stripParamSelector('[data-p-flag="on"] .a', 'flag', 'toggle', true), '.a');
+    assert.equal(stripParamSelector('[data-p-flag="on"] .a', 'flag', 'toggle', false), null);
+    assert.equal(stripParamSelector('[data-p-flag] .a', 'flag', 'toggle', true), '.a');
+    assert.equal(stripParamSelector('[data-p-flag] .a', 'flag', 'toggle', false), null);
+  });
+});