fix(javascript)!: avoid event payload copies in graph metadata (#1427)

Share the canonical string identity rule with endpoint projection, scope event keys to each emitter, and keep complete event/listener names in properties. Verify real CLI and stdio MCP with large names, registration/removal, distinct emitters, exact name seeds, reserved-prefix values, and unresolved dynamic names.

BREAKING CHANGE: New analyses use digest-based IDs for long or reserved-prefix event names and shorter event/listener display labels. Select IDs from the parent graph and read exact names from event_name properties. Stored graphs and their original IDs remain accepted for semantic tracing.

src/application/javascript/JavaScriptArtifactGraphFindings.ts

@@ -1,6 +1,6 @@
 import { createHash } from "node:crypto";
 
-import { digestCanonicalValue } from "../../domain/canonicalDigest.js";
+import { compactStringIdentityKey } from "../../domain/compactStringIdentity.js";
 import type { ApplicationNode } from "../../domain/javascript/javascriptApplicationGraphSchemas.js";
 import type { JavaScriptStaticAnalysis } from "../../domain/javascript/javascriptStaticAnalysisTypes.js";
 import type { JavaScriptArtifactFile } from "../../domain/javascript/javascriptArtifactFiles.js";
@@ -163,14 +163,7 @@ const addEndpoint = (
   const source =
     sourceNodeFor(context, input.file.path, input.value.module_key) ??
     input.asset;
-  const digestPrefix = "value-sha256:";
-  const valueKey = `${digestPrefix}${digestCanonicalValue(input.value.value, "JavaScript endpoint")}`;
-  // Reserve the digest prefix so an exact caller value cannot alias a digest key.
-  const key =
-    input.value.value.length <= valueKey.length &&
-    !input.value.value.startsWith(digestPrefix)
-      ? input.value.value
-      : valueKey;
+  const key = compactStringIdentityKey(input.value.value);
   const label = `${input.value.kind} endpoint`;
   const node = context.accumulator.addNode({
     kind: "endpoint",