feat: Remove file path from qualified names to prevent FTS pollution and add Go import reference tracking

Addresses qualified name pollution where file paths contaminated full-text search results. Removes file path prefix from buildQualifiedName output and method qualified names, keeping semantic hierarchy only. Also adds unresolved reference creation for Go imports to enable proper import edge resolution in the dependency graph.

src/extraction/tree-sitter.ts

@@ -368,11 +368,12 @@ export class TreeSitterExtractor {
    * Build qualified name from node stack
    */
   private buildQualifiedName(name: string): string {
-    // Get names from the node stack
-    const parts: string[] = [this.filePath];
+    // Build a qualified name from the semantic hierarchy only (no file path).
+    // The file path is stored separately in filePath and pollutes FTS if included here.
+    const parts: string[] = [];
     for (const nodeId of this.nodeStack) {
       const node = this.nodes.find((n) => n.id === nodeId);
-      if (node) {
+      if (node && node.kind !== 'file') {
         parts.push(node.name);
       }
     }
@@ -523,7 +524,7 @@ export class TreeSitterExtractor {
       isStatic,
     };
     if (receiverType) {
-      extraProps.qualifiedName = `${this.filePath}::${receiverType}::${name}`;
+      extraProps.qualifiedName = `${receiverType}::${name}`;
     }
 
     const methodNode = this.createNode('method', name, node, extraProps);
@@ -1033,6 +1034,7 @@ export class TreeSitterExtractor {
 
     // Go imports: single or grouped (creates one import per spec)
     if (this.language === 'go') {
+      const parentId = this.nodeStack.length > 0 ? this.nodeStack[this.nodeStack.length - 1] : null;
       const extractFromSpec = (spec: SyntaxNode): void => {
         const stringLiteral = spec.namedChildren.find(c => c.type === 'interpreted_string_literal');
         if (stringLiteral) {
@@ -1041,6 +1043,16 @@ export class TreeSitterExtractor {
             this.createNode('import', importPath, spec, {
               signature: getNodeText(spec, this.source).trim(),
             });
+            // Create unresolved reference so the resolver can create imports edges
+            if (parentId) {
+              this.unresolvedReferences.push({
+                fromNodeId: parentId,
+                referenceName: importPath,
+                referenceKind: 'imports',
+                line: spec.startPosition.row + 1,
+                column: spec.startPosition.column,
+              });
+            }
           }
         }
       };
@@ -1673,7 +1685,7 @@ export class TreeSitterExtractor {
 
           // For Pascal methods, also index qualified forms (e.g. TAuthService.Create).
           if (n.kind === 'method') {
-            const qualifiedParts = n.qualifiedName.split('::').slice(1); // drop file path
+            const qualifiedParts = n.qualifiedName.split('::');
             if (qualifiedParts.length >= 2) {
               // Create suffix keys so both "Module.Class.Method" and "Class.Method" can resolve.
               for (let i = 0; i < qualifiedParts.length - 1; i++) {