fix(javascript): yield during per-file projection and graph construction (#1525)

analyze_javascript_application ran several long phases with no event-loop
turn, so MCP ping and cancellation waited: each file's parse, analysis and
semantic projection; building every application node and relationship
before the application graph's first sealing step; and whole-graph schema
parses inside both immutable graph factories.

- Each file runs as steps (parse, static analysis, semantic analysis, then
  each projection pass), driven by the existing time-sliced checkpoint.
- Application graph input construction yields between phases, per module
  link and per file of findings.
- The pipeline transfers its privately built graph inputs to new sealing
  steps that validate the graph's own fields synchronously and elements,
  content checks and the digest in steps. The public copying factories
  keep their synchronous capture.

Results are unchanged: graph IDs and the complete result digest match main
on five inputs including Obsidian's 23 MB obsidian.asar. On the issue's
1,200-function fixture the longest event-loop block falls from about
290 ms to 90 ms, and ping after abort from up to 286 ms to at most 56 ms.
On obsidian.asar it falls from 10.9 s to 5.4 s; the rest is one analyzer
stage of a single very large file.

Refs #1462

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: N0zoM1z0 <161784452+N0zoM1z0@users.noreply.github.com>

src/application/javascript/JavaScriptArtifactGraphBuilder.ts

@@ -1,7 +1,7 @@
 import type { ArtifactInventorySnapshot } from "../../domain/artifactInventorySnapshot.js";
 import {
   createJavaScriptApplicationGraph,
-  createImmutableJavaScriptApplicationGraphSteps,
+  sealTransferredJavaScriptApplicationGraphSteps,
   type JavaScriptApplicationGraph,
 } from "../../domain/javascript/javascriptApplicationGraph.js";
 import type { JavaScriptModuleArtifactAnalysis } from "./JavaScriptArtifactAnalysisTypes.js";
@@ -15,9 +15,9 @@ import {
   addJavaScriptHtmlRoles,
   addJavaScriptSourceMapOriginals,
 } from "./JavaScriptArtifactGraphDocuments.js";
-import { addJavaScriptStaticFindings } from "./JavaScriptArtifactGraphFindings.js";
+import { addJavaScriptStaticFindingsSteps } from "./JavaScriptArtifactGraphFindings.js";
 import {
-  addJavaScriptModuleRelationships,
+  addJavaScriptModuleRelationshipsSteps,
   type JavaScriptModuleRelationshipOmissions,
   addJavaScriptSourceModules,
 } from "./JavaScriptModuleRelationships.js";
@@ -51,24 +51,42 @@ export const buildJavaScriptArtifactGraph = (
   analysis: JavaScriptModuleArtifactAnalysis,
 ): JavaScriptApplicationGraph =>
   createJavaScriptApplicationGraph(
-    buildJavaScriptArtifactGraphInput(snapshot, fileSet, analysis),
+    completeSynchronously(
+      buildJavaScriptArtifactGraphInputSteps(snapshot, fileSet, analysis),
+    ),
   );
 
-/** Build a validated application graph with cooperative immutable ownership. */
-export const buildImmutableJavaScriptArtifactGraphSteps = (
+/**
+ * Build a validated application graph with cooperative immutable ownership.
+ * Constructing the graph input also runs in steps: projecting every module
+ * relationship and finding at once held the event loop for seconds.
+ */
+export function* buildImmutableJavaScriptArtifactGraphSteps(
   snapshot: ArtifactInventorySnapshot,
   fileSet: JavaScriptArtifactFileSet,
   analysis: JavaScriptModuleArtifactAnalysis,
-): Generator<void, JavaScriptApplicationGraph> =>
-  createImmutableJavaScriptApplicationGraphSteps(
-    buildJavaScriptArtifactGraphInput(snapshot, fileSet, analysis),
+): Generator<void, JavaScriptApplicationGraph> {
+  const input = yield* buildJavaScriptArtifactGraphInputSteps(
+    snapshot,
+    fileSet,
+    analysis,
   );
+  // The input was built here and is not retained, so it can be transferred.
+  return yield* sealTransferredJavaScriptApplicationGraphSteps(input);
+}
 
-const buildJavaScriptArtifactGraphInput = (
+const completeSynchronously = <Value>(steps: Iterator<void, Value>): Value => {
+  for (;;) {
+    const step = steps.next();
+    if (step.done === true) return step.value;
+  }
+};
+
+function* buildJavaScriptArtifactGraphInputSteps(
   snapshot: ArtifactInventorySnapshot,
   fileSet: JavaScriptArtifactFileSet,
   analysis: JavaScriptModuleArtifactAnalysis,
-): unknown => {
+): Generator<void, unknown> {
   const accumulator = new JavaScriptArtifactGraphAccumulator();
   const root = createJavaScriptArtifactRootNode(accumulator, snapshot);
   const context: JavaScriptArtifactGraphContext = {
@@ -86,15 +104,23 @@ const buildJavaScriptArtifactGraphInput = (
     containerNodes: new Map([[snapshot.manifest.root_sha256, root]]),
   };
   addJavaScriptArtifactContainers(context);
+  yield;
   addJavaScriptArtifactFiles(context);
+  yield;
   const packageRoots = addJavaScriptPackageNodes(context);
+  yield;
   addJavaScriptSourceModules(context);
+  yield;
   const bundlerLimitations = addJavaScriptBundlerNodes(context);
-  const relationshipOmissions = addJavaScriptModuleRelationships(context);
-  const findingLimitations = addJavaScriptStaticFindings(context);
+  const relationshipOmissions =
+    yield* addJavaScriptModuleRelationshipsSteps(context);
+  const findingLimitations = yield* addJavaScriptStaticFindingsSteps(context);
   addElectronBoundaries(context);
+  yield;
   addJavaScriptHtmlRoles(context);
+  yield;
   addJavaScriptSourceMapOriginals(context);
+  yield;
   const coverage = graphCoverage(context);
   return {
     schema: "JavaScriptApplicationGraph",
@@ -111,7 +137,7 @@ const buildJavaScriptArtifactGraphInput = (
       ...graphLimitations(context, coverage.status, relationshipOmissions),
     ],
   };
-};
+}
 
 const graphCoverage = (context: JavaScriptArtifactGraphContext) => {
   const resourceLimits = semanticResourceLimits(context);