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>

scripts/setup-memory-v2-personal-schema.mjs

@@ -0,0 +1,15 @@
+import { createDbPool } from '../db.mjs';
+import { ensurePersonalMemoryCandidateSchema } from '../memory-v2-personal-store.mjs';
+
+if (process.env.MEMORY_PERSONAL_SCHEMA_CONFIRM !== 'local-only') {
+  throw new Error('Refusing schema change: set MEMORY_PERSONAL_SCHEMA_CONFIRM=local-only explicitly');
+}
+
+const pool = createDbPool();
+try {
+  await ensurePersonalMemoryCandidateSchema(pool);
+  console.log('Memory V2 personal candidate schema ready.');
+} finally {
+  await pool.end();
+}
+