fix(javascript): yield inside semantic analysis and large projection passes (#1542)

* fix(javascript): yield inside semantic analysis and large projection passes

After #1525 the longest event-loop blocks were single stages on very large
files: semantic analysis of Obsidian's 3.7 MB app.js ran 5.8 s in one piece,
and its object projection 1.8 s.

- analyzeParsedJavaScriptSemanticsSteps yields between the analysis phases
  and between the eight derived collectors; the synchronous function drains
  it, so results are unchanged.
- Per-file analysis yields between open-receiver classification and static
  analysis and drives the semantic steps.
- Semantic node creation, definitions and references, and the object and
  frontier passes yield every 64 items. Node creation keeps source order,
  which the per-file node budget depends on.

On obsidian.asar the longest block falls from 5,355 ms to 907 ms with the
same total time (40.6 s to 39.5 s). Graph IDs and complete result digests
match main on five inputs. Remaining blocks up to about 0.9 s are single
AST traversal passes inside the analyzers.

Refs #1462

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* refactor(javascript): drop the unused synchronous derived-semantics wrapper

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

---------

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

src/application/javascript/JavaScriptSemanticGraphFlowProjection.ts

@@ -240,10 +240,11 @@ export const projectSemanticClosureCaptures = (
 };
 
 /** Retain bounded unresolved dynamic-call, dynamic-property and dynamic-scope frontiers. */
-export const projectSemanticFrontiers = (
+export function* projectSemanticFrontiers(
   context: SemanticFlowProjectionContext,
-): void => {
-  for (const frontier of context.ir.frontiers) {
+): Generator<void, void> {
+  for (const [index, frontier] of context.ir.frontiers.entries()) {
+    if (index % 64 === 0) yield;
     // Dynamic environments leave identifier reads and writes unresolved.
     const family =
       frontier.kind === "dynamic-call"
@@ -275,4 +276,4 @@ export const projectSemanticFrontiers = (
     );
     addSemanticGraphUnknown(context.state, unknown);
   }
-};
+}