fix(javascript): bound semantic unknown retention at projection

Admit unknowns before canonical construction and provenance interning. Offer independent per-file and application capacities through CLI, Evidence and the owned analysis worker, and reject over-allocation during streamed decoding.

Report examined omitted emission occurrences by family and reason without retaining discarded identities. Preserve omission-free graph identities and distinguish node truncation from overall partial coverage.

Fixes #4797

src/javascript/analysis/JavaScriptAnalysisWorkerSchemas.ts

@@ -1,3 +1,4 @@
+import { javaScriptSemanticUnknownOmissionsSchema } from "../../domain/javascript/javascriptSemanticGraphSchemas.js";
 import { z } from "zod";
 import { digestSchema } from "../../domain/digests.js";
 import type { JavaScriptStaticAnalysis } from "../../domain/javascript/javascriptStaticAnalysisTypes.js";
@@ -653,8 +654,10 @@ export const javaScriptWorkerGraphRecordSchema = z.discriminatedUnion("kind", [
 
 /** Portable per-file header, before any graph binding or immutable proof. */
 export const javaScriptWorkerProjectionHeaderSchema = z.strictObject({
+  omittedUnknownOccurrences:
+    javaScriptSemanticUnknownOmissionsSchema.exactOptional(),
   roots: z.array(javaScriptSemanticNodeSchema.shape.node_id),
-  truncated: z.boolean(),
+  nodesTruncated: z.boolean(),
 });
 
 /** Module facts are transferred individually to avoid a whole-IR JSON string. */