Capture the receiver for a two segment Kotlin navigation call

Still toward issue 1698, still no behavior change: the variable is
computed but nothing reads it yet.

A capitalized two segment receiver (MessageHelper in
MessageHelper.isRoomClosed()) names an object singleton or a class or
companion member, statically unambiguous in source. Captured
separately from member_receiver so the existing in file bare name
lookup and its capitalized receiver deferral guard are untouched;
threading this into raw_calls for a dedicated cross file resolver
lands next.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

graphify/extractors/engine.py

@@ -5896,6 +5896,23 @@ def _extract_generic(
                         segments = _kotlin_nav_identifier_segments(first, source)
                         if segments is not None and len(segments) >= 3:
                             kotlin_qualified_prefix = ".".join(segments[:-1])
+                        # #1698: the plain `Receiver.method()` shape (exactly
+                        # two segments) is neither a fully qualified name nor
+                        # eligible for member_receiver (same reasoning as
+                        # above). A capitalized receiver here is an object
+                        # singleton or a class/companion member reference —
+                        # statically unambiguous, no type inference needed —
+                        # captured separately so a dedicated cross-file pass
+                        # can resolve it by declared-type name when the in
+                        # file bare name lookup below finds nothing (the
+                        # cross-file case this issue is about; the same-file
+                        # case already resolves through that lookup and never
+                        # reaches raw_calls at all).
+                        elif (
+                            segments is not None and len(segments) == 2
+                            and segments[0][:1].isupper()
+                        ):
+                            kotlin_object_receiver = segments[0]
             elif config.ts_module == "tree_sitter_scala":
                 # Scala: first child
                 first = node.children[0] if node.children else None