fix(javascript): retain unresolved network targets with provenance

Resolve stable lexical and URL targets using shared effects, and preserve unresolved request expressions as partial facts. Carry their uncertainty through workers, artifact graphs, and the CLI. Scope partial endpoint identity to the source site.

Refs: #3451, #3534

Co-authored-by: Hemang Varshney <218273197+hemv-857@users.noreply.github.com>

src/domain/javascript/javascriptStaticAnalysis.event_source.test.ts

@@ -34,7 +34,15 @@ describe("server-sent event endpoints", () => {
     ]);
   });
 
-  it("keeps a dynamic EventSource URL unreported", () => {
-    expect(endpoints("new EventSource(url);")).toEqual([]);
+  it("retains a dynamic EventSource target as partial source evidence", () => {
+    expect(
+      analyzeJavaScriptStaticSource("new EventSource(url);").endpoints,
+    ).toEqual([
+      expect.objectContaining({
+        value: "url",
+        mechanism: "call:EventSource",
+        resolution: "partial",
+      }),
+    ]);
   });
 });