fix(python): bare class references produce references edges to classes (#1478) (#1493)

Python's class-as-value idioms (return SomeClass, x = SomeClass, registry
dicts, classes passed as arguments) produced no references edges, so
callers/impact on a Django/DRF serializer missed the views that consume it.
Three gates dropped them:

- return_statement was never dispatched by PYTHON_SPEC (kernel mirrored)
- the extraction gate (definedHere) collected function/method names only
- resolution accepted function/method targets only (matchFunctionRef +
  the function_ref import fast path)

Capture return_statement for Python (single expression; tuple returns not
descended), admit same-file CLASS names to the gate, and accept class
targets for Python bare identifiers — scoped to Python so the TS/JS KIND
FILTER contract is untouched. The docopt false-positive mechanism behind
the function-only rule (lowercase locals vs same-named methods) doesn't
transfer: methods stay excluded for bare ids, and the same-file/import
gate + unique-or-drop rules still apply.

Probed on django-rest-framework (~250 files): 559 new references→class
edges, 10/10 sampled genuine (serializer_class = AuthTokenSerializer, the
ModelSerializer field-mapping registry, aliases, ctor args, isinstance).
EXTRACTION_VERSION 24 → 25.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

src/resolution/index.ts

@@ -915,7 +915,15 @@ export class ReferenceResolver {
       const viaImport = this.gateLanguage(resolveViaImport(ref, this.context), ref);
       if (viaImport) {
         const target = this.queries.getNodeById(viaImport.targetNodeId);
-        if (target && (target.kind === 'function' || target.kind === 'method')) {
+        if (
+          target &&
+          (target.kind === 'function' ||
+            target.kind === 'method' ||
+            // Python (#1478): an imported class used as a value (`return
+            // OrgSerializerFull`) resolves through its import like any
+            // callback — mirrors matchFunctionRef's bareClassOk.
+            (ref.language === 'python' && target.kind === 'class'))
+        ) {
           return viaImport;
         }
       }