feat: implement variable-bound FOL domain resolution for descendants/children

- Extend DomainResolver.resolve() signature to accept optional BindingEnv
  so that parentVar domains can be resolved with runtime variable bindings
- Pass BindingEnv through evaluateForAll/evaluateExists to resolver calls
- Add buildAncestorIndex() to precompute DOM ancestor sets from CDP data
- SelectorDomainResolver now filters descendant domains by the bound parent
  when domain.parentVar is present and ancestor index is available
- Return undefined for parentVar domains when no ancestor index or env
  (prevents silent fallback to global domain resolution)
- Update all test DomainResolver mocks for new resolve interface
- Add 10 unit tests covering ancestor index construction, backward compat,
  descendant filtering, exclusion of non-descendants, empty descendants,
  missing parentVar/env, and no-ancestor-index safety

packages/imhotep-playwright/src/check-all.ts

@@ -31,6 +31,7 @@ import {
   specStore,
   extractWorld,
   SelectorDomainResolver,
+  buildAncestorIndex,
   compileCanonicalClauseToFormula,
   getSelectorsFromAssertion,
   getSelectorsFromFormula,
@@ -552,6 +553,10 @@ export function makeCheckAll(deps: CheckAllDeps): ImhotepUi['checkAll'] {
           resolver.register(selector, [])
         }
       }
+      const ancestorIndex = buildAncestorIndex(world)
+      if (ancestorIndex.size > 0) {
+        resolver.setAncestorIndex(ancestorIndex)
+      }
 
       for (let i = 0; i < validChecks.length; i++) {
         const check = validChecks[i]
@@ -642,6 +647,10 @@ export function makeCheckAll(deps: CheckAllDeps): ImhotepUi['checkAll'] {
       for (const [selector, ids] of extracted.selectorToIds) {
         resolver.register(selector, ids)
       }
+      const stateAncestorIndex = buildAncestorIndex(extracted.world)
+      if (stateAncestorIndex.size > 0) {
+        resolver.setAncestorIndex(stateAncestorIndex)
+      }
 
       const folResult = evaluateLogic({
         formula: check.formula,