fix(javascript): stop reporting self-defaulted receivers as module loads (#8109)

The CommonJS loader search treated any repeated state on its own ancestor
chain as an unknown loader. A self-default such as
`session.messages = session.messages || []` forms that cycle, because a
member read inside the assigned value was attributed to the later call's
read site and selected the same write again. Each `push` on the value was
then reported as an unresolved `require` load, and graph coverage became
partial.

Record a member read inside a flowed value as a depth-1 captured selection
at its own position, as member mutations already do for flowed origins.
Treat a revisited state as adding no source; the cycle's other entries are
still expanded once each. Remove the superseded ancestor tracking.

Fixes #8102

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/domain/javascript/javascriptSemanticRequireOrigin.ts

@@ -970,16 +970,22 @@ const inheritLoaderSourceContext = (
     ),
   }));
 
+// A later read site selects only the remaining path. This member selects its
+// own key when it is evaluated, so `o.k = o.k || d` reads o.k before the write.
 const loaderMemberSource = (
   current: ModuleObjectSource,
   member: t.MemberExpression | t.OptionalMemberExpression,
 ): ModuleObjectSource => ({
   node: member.object,
   readAt: current.readAt ?? member,
-  capturedSelections: semanticShiftCapturedSelections(
-    current.capturedSelections,
-    1,
-  ),
+  capturedSelections:
+    current.readAt === undefined
+      ? semanticShiftCapturedSelections(current.capturedSelections, 1)
+      : semanticNormalizeCapturedSelections([
+          { at: member, depth: 1 },
+          ...(semanticShiftCapturedSelections(current.capturedSelections, 1) ??
+            []),
+        ]),
   path: [
     semanticStaticPropertyKey(member.property, member.computed),
     ...current.path,
@@ -1056,13 +1062,10 @@ const hasCommonJsModuleSource = (
   readAt?: t.Node,
 ): boolean => {
   type Work = ModuleObjectSource & {
-    readonly ancestors: ReadonlySet<object>;
     /** Await occurs after this many requested outer property selections. */
     readonly awaitDepths: readonly number[];
   };
-  const pending: Work[] = [
-    { node, path: [], readAt, ancestors: new Set(), awaitDepths: [] },
-  ];
+  const pending: Work[] = [{ node, path: [], readAt, awaitDepths: [] }];
   // Keep depths separate and join finite key alternatives at each source read.
   const selections = new SemanticAliasSelections(() => {
     state.valueResourceLimits.add("alias-selections");
@@ -1108,13 +1111,10 @@ const hasCommonJsModuleSource = (
       identity = {};
       context.identities.set(pathKey, identity);
     }
-    if (next.ancestors.has(identity)) {
-      if (includeUnknown) return true;
-      continue;
-    }
+    // A revisited state adds no source. A cycle's other entries are expanded
+    // once each, so a cycle is not an unknown loader.
     if (examined.has(identity)) continue;
     examined.add(identity);
-    const ancestors = new Set([...next.ancestors, identity]);
     const enqueueAt = (
       depths: readonly number[],
       ...sources: ModuleObjectSource[]
@@ -1122,7 +1122,6 @@ const hasCommonJsModuleSource = (
       pending.push(
         ...inheritLoaderSourceContext(next, sources).map((source) => ({
           ...source,
-          ancestors,
           awaitDepths: depths,
         })),
       );