fix(wasm): align typed-receiver CHA dispatch confidence to 0.8

The inline CHA expansion in buildCallEdges and buildChaPostPass used
computeConfidence(relPath, t.file) - CHA_DISPATCH_PENALTY for all CHA
targets, producing 0.6 for cross-directory interface dispatch (same-dir
= 0.7, minus 0.1 penalty). runChaPostPass (helpers.ts) and
runPostNativeCha (native-orchestrator.ts) both hardcode 0.8 for
interface/CHA-dispatch edges.

The deduplication in runChaPostPass uses the existing DB edge as-is
and skips reinsertion, so the 0.6 edges from the inline pass were never
upgraded to 0.8.

Fix: typed-receiver (interface) dispatch branches now use hardcoded 0.8
matching the post-pass constants. The this/super branch keeps
computeConfidence-based proximity scoring to remain aligned with
runPostNativeThisDispatch.

parity-compare.mjs --langs typescript --hybrid goes green (was 12
edge diffs). Closes #1470

docs check acknowledged

Author: carlos-alm

src/domain/graph/builder/stages/build-edges.ts

@@ -709,6 +709,7 @@ function buildChaPostPass(
 
       const caller = findCaller(lookup, call, symbols.definitions, relPath, fileNodeRow);
       let chaTargets: ReadonlyArray<{ id: number; file: string }> = [];
+      let isTypedReceiverDispatch = false;
 
       if (call.receiver === 'this' || call.receiver === 'self' || call.receiver === 'super') {
         chaTargets = resolveThisDispatch(
@@ -727,13 +728,21 @@ function buildChaPostPass(
           : null;
         if (typeName) {
           chaTargets = resolveChaTargets(typeName, call.name, chaCtx, lookup);
+          isTypedReceiverDispatch = true;
         }
       }
 
       for (const t of chaTargets) {
         const edgeKey = `${caller.id}|${t.id}`;
         if (t.id !== caller.id && !seenByPair.has(edgeKey)) {
-          const conf = computeConfidence(relPath, t.file, null) - CHA_DISPATCH_PENALTY;
+          // Typed-receiver (interface/CHA) dispatch: use the same hardcoded 0.8 that
+          // runChaPostPass (helpers.ts) and runPostNativeCha (native-orchestrator.ts)
+          // use — file proximity is not meaningful for virtual dispatch confidence.
+          // this/super dispatch keeps computeConfidence-based proximity scoring to
+          // match runPostNativeThisDispatch (native-orchestrator.ts).
+          const conf = isTypedReceiverDispatch
+            ? 0.8
+            : computeConfidence(relPath, t.file, null) - CHA_DISPATCH_PENALTY;
           if (conf > 0) {
             seenByPair.add(edgeKey);
             allEdgeRows.push([caller.id, t.id, 'calls', conf, 0, 'cha']);
@@ -1278,6 +1287,7 @@ function buildFileCallEdges(
     // For typed receiver calls: expand to all instantiated concrete implementations.
     if (chaCtx && call.receiver) {
       let chaTargets: ReadonlyArray<{ id: number; file: string }> = [];
+      let isTypedReceiverDispatch = false;
       if (call.receiver === 'this' || call.receiver === 'self' || call.receiver === 'super') {
         chaTargets = resolveThisDispatch(
           call.name,
@@ -1295,12 +1305,20 @@ function buildFileCallEdges(
           : null;
         if (typeName) {
           chaTargets = resolveChaTargets(typeName, call.name, chaCtx, lookup);
+          isTypedReceiverDispatch = true;
         }
       }
       for (const t of chaTargets) {
         const edgeKey = `${caller.id}|${t.id}`;
         if (t.id !== caller.id && !seenCallEdges.has(edgeKey) && !ptsEdgeRows.has(edgeKey)) {
-          const conf = computeConfidence(relPath, t.file, null) - CHA_DISPATCH_PENALTY;
+          // Typed-receiver (interface/CHA) dispatch: use the same hardcoded 0.8 that
+          // runChaPostPass (helpers.ts) and runPostNativeCha (native-orchestrator.ts)
+          // use — file proximity is not meaningful for virtual dispatch confidence.
+          // this/super dispatch keeps computeConfidence-based proximity scoring to
+          // match runPostNativeThisDispatch (native-orchestrator.ts line 906).
+          const conf = isTypedReceiverDispatch
+            ? 0.8
+            : computeConfidence(relPath, t.file, null) - CHA_DISPATCH_PENALTY;
           if (conf > 0) {
             seenCallEdges.add(edgeKey);
             allEdgeRows.push([caller.id, t.id, 'calls', conf, 0, 'cha']);