feat(memory): add user_namespace and working memory config fields

src/config/schema.ts

@@ -610,6 +610,17 @@ const memorySchema = z.object({
   max_context_tokens: z.number().min(100).max(10000).default(2000),
   embedding: embeddingSchema,
   qmd: qmdSchema,
+  /**
+   * When set, all channels share user/* memory (unified identity namespace).
+   * Absent = current session-scoped behavior, unchanged.
+   */
+  user_namespace: z.string().optional(),
+  /** How long working memory remains valid after the last compaction (days). */
+  working_memory_ttl_days: z.number().min(1).max(365).default(14),
+  /** Token budget for working memory injection at session start. */
+  working_memory_max_tokens: z.number().min(100).max(4000).default(1000),
+  /** When true, instruct the model to acknowledge prior context on session start. */
+  proactive_session_greeting: z.boolean().default(false),
 }).default({});
 
 const compactionSchema = z.object({