refactor(resolver): confidence filter in class-scoped Rust lookup; runPostNativeCha returns count

- edge_builder.rs: align class-scoped lookup with WASM call-resolver.ts
  by adding compute_confidence >= 0.5 filter, matching all other lookup
  paths in the same block (#1403)
- native-orchestrator.ts: change runPostNativeCha return type from
  Set<number> to number — caller only reads .size, individual IDs are
  never used; clearer intent and avoids the unused Set allocation (#1403)

Author: carlos-alm

crates/codegraph-core/src/edge_builder.rs

@@ -514,7 +514,10 @@ fn resolve_call_targets<'a>(
             let qualified = format!("{}.{}", class_prefix, call.name);
             let class_scoped: Vec<&NodeInfo> = ctx.nodes_by_name
                 .get(qualified.as_str())
-                .map(|v| v.iter().filter(|n| n.kind == "method").copied().collect())
+                .map(|v| v.iter()
+                    .filter(|n| n.kind == "method"
+                        && import_resolution::compute_confidence(rel_path, &n.file, None) >= 0.5)
+                    .copied().collect())
                 .unwrap_or_default();
             if !class_scoped.is_empty() { return class_scoped; }
         }

src/domain/graph/builder/stages/native-orchestrator.ts

@@ -406,12 +406,12 @@ async function runPostNativeAnalysis(
  * can re-classify roles for the affected implementation files.  An empty set
  * means no edges were added and role re-classification is unnecessary.
  */
-function runPostNativeCha(db: BetterSqlite3Database): Set<number> {
+function runPostNativeCha(db: BetterSqlite3Database): number {
   // Fast guard: no hierarchy edges → no CHA work
   const hasHierarchy = db
     .prepare(`SELECT 1 FROM edges WHERE kind IN ('extends', 'implements') LIMIT 1`)
     .get();
-  if (!hasHierarchy) return new Set();
+  if (!hasHierarchy) return 0;
 
   // Build implementors map: parent/interface name → [child/implementing class names]
   const hierarchyRows = db
@@ -433,7 +433,7 @@ function runPostNativeCha(db: BetterSqlite3Database): Set<number> {
     }
     if (!list.includes(row.child_name)) list.push(row.child_name);
   }
-  if (implementors.size === 0) return new Set();
+  if (implementors.size === 0) return 0;
 
   // RTA: collect class names that are actually instantiated via `new X()`.
   // Primary query targets `class`-kind nodes (the canonical schema).
@@ -506,7 +506,7 @@ function runPostNativeCha(db: BetterSqlite3Database): Set<number> {
     `SELECT id, file AS method_file FROM nodes WHERE name = ? AND kind = 'method'`,
   );
   const newEdges: Array<[number, number, string, number, number, string]> = [];
-  const newTargetIds = new Set<number>();
+  let newEdgeCount = 0;
 
   for (const { source_id, method_name, caller_file } of callToMethods) {
     const dotIdx = method_name.indexOf('.');
@@ -545,7 +545,7 @@ function runPostNativeCha(db: BetterSqlite3Database): Set<number> {
               CHA_DISPATCH_PENALTY;
             if (conf <= 0) continue;
             newEdges.push([source_id, methodNode.id, 'calls', conf, 0, 'cha']);
-            newTargetIds.add(methodNode.id);
+            newEdgeCount++;
           }
         }
 
@@ -558,7 +558,7 @@ function runPostNativeCha(db: BetterSqlite3Database): Set<number> {
   if (newEdges.length > 0) {
     db.transaction(() => batchInsertEdges(db, newEdges))();
   }
-  return newTargetIds;
+  return newEdgeCount;
 }
 
 /**
@@ -1555,8 +1555,8 @@ export async function tryNativeOrchestrator(
   // pre-CHA might be near the median, but post-CHA the median is higher, changing
   // its role from utility → core.) Using an incremental pass with a stale median
   // cache would produce incorrect roles outside the CHA-affected file set.
-  const chaTargetIds = runPostNativeCha(ctx.db as unknown as BetterSqlite3Database);
-  if (chaTargetIds.size > 0) {
+  const chaEdgeCount = runPostNativeCha(ctx.db as unknown as BetterSqlite3Database);
+  if (chaEdgeCount > 0) {
     try {
       const db = ctx.db as unknown as BetterSqlite3Database;
       const { classifyNodeRoles } = (await import('../../../../features/structure.js')) as {
@@ -1566,7 +1566,7 @@ export async function tryNativeOrchestrator(
         ) => Record<string, number>;
       };
       classifyNodeRoles(db);
-      debug(`CHA post-pass: full role re-classification after ${chaTargetIds.size} new CHA edges`);
+      debug(`CHA post-pass: full role re-classification after ${chaEdgeCount} new CHA edges`);
     } catch (err) {
       debug(`CHA post-pass role re-classification failed: ${toErrorMessage(err)}`);
     }