feat: enable dual-layer memory — MEMORY.md (5K chars) + Holographic SQLite

- memory_enabled: true (was missing — MEMORY.md was disabled)
- user_profile_enabled: true (USER.md also disabled)
- memory_char_limit: 5000 (default was 2200)
- user_char_limit: 3000 (default was 1375)
- holographic provider unchanged, both layers now work together

config.yaml

@@ -25,6 +25,10 @@ platforms:
       port: 8642
       cors_origins: "*"
 memory:
+  memory_enabled: true
+  user_profile_enabled: true
+  memory_char_limit: 5000
+  user_char_limit: 3000
   provider: holographic
   auto_extract: true
   default_trust: 0.5