feat(javascript): report observed export property presence (#1160)

* feat(javascript): report observed export property presence

Extend compare_javascript_export_shapes so each retained return variant
lists observed property names and each change reports presence independently
of value resolution. Complete parent coverage classifies one-sided names as
added or removed even when static values stay unknown.

Fixes #725

* test(javascript): match unknown export-shape values by availability

Nested availability objects include a reason when values stay unresolved.
Assert availability through objectContaining so presence-only added and
removed rows still verify unknown values.

* fix(javascript): preserve uncertain export property presence and locations

* fix(javascript): normalize presence and preserve local property coverage

* fix(javascript): require present discriminants for return pairing

* fix(javascript): normalize retained shapes before comparison

* refactor(javascript): share return projection with executable examples

* fix(javascript): localize uncertainty for missing mutated slots

* fix(javascript): bind advertised export examples to exact artifacts

* fix(javascript): keep uncertain property flow as candidates

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Co-authored-by: morluto <76467478+morluto@users.noreply.github.com>

src/application/javascript/JavaScriptModuleRelationships.ts

@@ -32,7 +32,7 @@ import {
   resolveArtifactPathByContext,
   type ArtifactPathResolution,
 } from "./JavaScriptArtifactPathResolution.js";
-import { projectJavaScriptExportReturnShapes } from "./JavaScriptReturnShapeProjection.js";
+import { projectJavaScriptExportReturnShapes } from "../../domain/javascript/javascriptExportReturnShapeProjection.js";
 
 import type { JavaScriptModuleSemanticIr } from "./JavaScriptArtifactAnalysisTypes.js";