fix: CDP extraction concurrency + topology ID remapping + predicate completeness

CDP protocol fixes:
- session.ts: getDocumentRootNodeId() now pushes {depth:-1} full DOM tree
  (was shallow default, causing querySelectorAll to find zero nodes)
- extraction.ts: serialize resolveSelector calls (was concurrent Promise.all,
  CDP DOM.querySelectorAll is not safe for concurrent calls on same session)

Topology ID mismatch fixes (critical — backendNodeId vs solver subject ID):
- extraction.ts: add remapTopologyIds() — builds Map<backendNodeId,solverId>
  from world.subjects.domNodeId/ids, remaps all 6 topology arrays +
  clipping.subjectId + scroll.containerId
- topology.ts: createsStackingContext() now checks contain:paint|layout
  (both create stacking contexts per CSS spec, was missing)
- topology.ts: evaluateInStackingContext() handles unary (no reference)

Predicate completeness:
- predicates.ts: 3 new evaluators — intersects, touches, hasGap (indices 31-33)
- predicates.ts: escapeClippingChainOf replaced indeterminate stub with
  deterministic 2-ary evaluator (overflow + clip chain + ancestry checks)
- predicates.ts: attachedToScrollContainer arity 1→2, checks reference match
- predicates.ts: 7 aliases + 4 alignment aliases promoted to BUILTIN_PREDICATES

DSL grammar fixes:
- grammar.ts: isKeywordThatCanBePredicate() extended with all missing keywords
- lower-to-canonical.ts: add TopologyAssertion lowering (was silently dropped)
- compiler.ts: add intersects/touches/hasGap relation codes
- validator.ts: add option sets for new predicates
- lexer.ts: add intersects/touches/hasGap token kinds

Safety + infrastructure:
- joins.ts: MAX_CARTESIAN_TUPLES=100,000 guard with descriptive error
- extraction.ts: computeRequiredFacts() registers defaults + broadens topology gate
- package.json: add missing imhotep-state dependency to imhotep-playwright

Tests:
- 9 new predicate tests (intersects, touches, hasGap, escapeClippingChainOf)
- Convert stale separatedFrom/contains GAP tests to working assertions
- Add computeRequiredFacts topology gating tests (public.test.ts)

packages/imhotep-playwright/src/extraction.ts

@@ -188,6 +188,7 @@ export function computeRequiredFacts(formulas: FormulaNode[]): {
   fragments: boolean
   domAncestry: boolean
 } {
+  registerDefaultPredicates()
   const facts = new Set<string>()
   for (const formula of formulas) {
     const predicates = collectPredicates(formula)
@@ -222,9 +223,11 @@ export function computeRequiredFacts(formulas: FormulaNode[]): {
     return found
   })
 
+  const needsTopology = Array.from(facts).some((f) => f.startsWith('topology.') || f.endsWith('.clipChain'))
+
   return {
     geometry: true, // Always required for subject resolution
-    topology: facts.has('topology.stackingContextOf') || facts.has('subject.clipChain'),
+    topology: needsTopology,
     styles: facts.has('styles') || facts.has('computedStyle') || needsCssLengthMetrics,
     fragments: facts.has('subject.fragmentCount') || facts.has('subject.firstFragmentId'),
     domAncestry: needsDomAncestry,
@@ -732,6 +735,40 @@ export async function extractWorldFastGeometry(
 // CDP Extraction
 // ---------------------------------------------------------------------------
 
+function remapTopologyIds(world: GeometryWorld): void {
+  const nSubjects = world.subjects.ids.length
+  if (nSubjects === 0) return
+
+  const backendToSolver = new Map<number, number>()
+  for (let i = 0; i < nSubjects; i++) {
+    backendToSolver.set(world.subjects.domNodeId[i], world.subjects.ids[i])
+  }
+
+  const remap = (src: ArrayLike<number>): number[] => {
+    const out = new Array<number>(src.length)
+    for (let i = 0; i < src.length; i++) {
+      const backendId = src[i]
+      out[i] = backendId > 0 ? (backendToSolver.get(backendId) ?? 0) : 0
+    }
+    return out
+  }
+
+  const t = world.topology
+  t.containingBlockOf = remap(t.containingBlockOf)
+  t.nearestPositionedAncestorOf = remap(t.nearestPositionedAncestorOf)
+  t.scrollContainerOf = remap(t.scrollContainerOf)
+  t.stackingContextOf = remap(t.stackingContextOf)
+  t.formattingContextOf = remap(t.formattingContextOf)
+  t.clippingRootOf = remap(t.clippingRootOf)
+
+  if (world.clipping) {
+    world.clipping.subjectId = remap(world.clipping.subjectId)
+  }
+  if (world.scroll) {
+    world.scroll.containerId = remap(world.scroll.containerId)
+  }
+}
+
 export async function extractWorldCdp(
   playwrightPage: Page,
   selectors: string[],
@@ -751,15 +788,13 @@ export async function extractWorldCdp(
   try {
     await sessionManager.enableDomain('DOM')
 
-    const session = sessionManager.getSession()
-    await session.send('DOM.getDocument', { depth: -1 })
-
     const allQueries = selectorPlans.flatMap((plan) =>
       plan.queries.map((query) => ({ key: plan.key, query })),
     )
-    const allMatches = await Promise.all(
-      allQueries.map(({ query }) => resolveSelector(sessionManager, query)),
-    )
+    const allMatches: Awaited<ReturnType<typeof resolveSelector>>[] = []
+    for (const { query } of allQueries) {
+      allMatches.push(await resolveSelector(sessionManager, query))
+    }
     const resolvedSubjects: Array<{ id: string; selector: string; nodeId: number; backendNodeId: number }> = []
     for (let i = 0; i < allQueries.length; i++) {
       const { key, query } = allQueries[i]
@@ -830,6 +865,8 @@ export async function extractWorldCdp(
       fontWeight: Array.from(canonical.styles.fontWeight),
     }
 
+    remapTopologyIds(world)
+
     const selectorToIds = new Map<string, number[]>()
     for (const [selectorKey, nodeIds] of selectorToNodeIds) {
       const idSet = new Set(nodeIds)