perf(javascript)!: stop repeating the semantic identifier strategy per fact (#1474)

Every semantic graph node and relation carried an identifier_strategy
object whose schema admits exactly one value per record type. The
constant made up about 9% of analyze_javascript_application output
(Obsidian app.asar: 12.04 MB to 10.96 MB), and semantic traces repeated
it on every returned fact.

The node_id and relation_id schema descriptions now state how each
identifier is derived.

BREAKING CHANGE: Semantic graph nodes and relations no longer include
identifier_strategy, and relation IDs no longer hash that constant.
Evidence recorded by earlier versions does not validate against the new
semantic graph schema.

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

src/domain/javascript/javascriptSemanticGraph.ts

@@ -127,10 +127,6 @@ export const createJavaScriptSemanticGraphNode = (
     ...parsed,
     application_node_ids: uniqueSorted(parsed.application_node_ids),
     evidence: evidenceContexts.intern(parsed.evidence),
-    identifier_strategy: {
-      strategy: "semantic-content-sha256" as const,
-      stability: "artifact-version" as const,
-    },
   };
   return javaScriptSemanticNodeSchema.parse({
     ...semantic,
@@ -147,10 +143,6 @@ export const createJavaScriptSemanticGraphRelation = (
   const semantic = {
     ...parsed,
     evidence: evidenceContexts.intern(parsed.evidence),
-    identifier_strategy: {
-      strategy: "semantic-content-sha256" as const,
-      stability: "relationship-exact" as const,
-    },
   };
   return javaScriptSemanticRelationSchema.parse({
     ...semantic,