feat(memory-v2): restore personal shadow pipeline and candidate store

Recover WIP modules from stash so admin can persist capability config,
observe chat writes in shadow mode, and review persisted candidates.

Co-authored-by: Cursor <cursoragent@cursor.com>

memory-v2-runtime.mjs

@@ -4,6 +4,8 @@ import { createLangGraphHttpClient, createLangGraphMemoryBackend } from './memor
 import { createLegacyMemoryBackend, createMemoryV2, resolveMemoryV2Policy } from './memory-v2.mjs';
 import { createLettaHttpClient, createLettaMemoryBackend } from './memory-v2-letta.mjs';
 import { createMemoryV2PluginBackends } from './memory-v2-plugin-backends.mjs';
+import { createPersonalMemoryShadowPipeline } from './memory-v2-personal-shadow.mjs';
+import { createPersonalMemoryCandidateStore } from './memory-v2-personal-store.mjs';
 import { createMem0HttpClient, createMem0MemoryBackend } from './memory-v2-mem0.mjs';
 import { createNeo4jHttpClient, createNeo4jMemoryBackend } from './memory-v2-neo4j.mjs';
 import { createPgvectorMemoryBackend } from './memory-v2-pgvector.mjs';
@@ -400,11 +402,19 @@ export async function createMemoryV2Runtime({
     ],
   }));
 
+  const personalCandidateStore = readFlag(env, 'MEMORY_CANDIDATE_PERSISTENCE_ENABLED', false)
+    ? createPersonalMemoryCandidateStore(mysqlPool)
+    : null;
+  const personalShadowPipeline = createPersonalMemoryShadowPipeline({
+    env,
+    store: personalCandidateStore,
+  });
   const memory = createMemoryV2({
     legacyMemoryService,
     backends,
     env,
     logger,
+    personalShadowPipeline,
   });
 
   const pgBackfillEnabled = readFlag(env, 'MEMORY_PGVECTOR_BACKFILL_ENABLED', pgvectorEnabled);
@@ -593,6 +603,11 @@ export async function createManagedMemoryV2Runtime({
       return runtime.compact(input);
     },
 
+    async observePersonalMemory(input = {}) {
+      const runtime = await ensureRuntime();
+      return runtime.observePersonalMemory(input);
+    },
+
     async close() {
       const runtime = activeRuntime;
       activeRuntime = null;