feat: split memories part 2 (#19860)

Keep extracting memories out of core and moving the write trigger in the
app-server
This is temporary and it should move at the client level as a follow-up
This makes core fully independant from `codex-memories-write`

---------

Co-authored-by: Codex <noreply@openai.com>

codex-rs/core/src/config/mod.rs

@@ -62,7 +62,7 @@ use codex_features::MultiAgentV2ConfigToml;
 use codex_git_utils::resolve_root_git_project_for_trust;
 use codex_login::AuthManagerConfig;
 use codex_mcp::McpConfig;
-use codex_memories_write::memory_root;
+use codex_memories_read::memory_root;
 use codex_model_provider_info::LEGACY_OLLAMA_CHAT_PROVIDER_ID;
 use codex_model_provider_info::ModelProviderInfo;
 use codex_model_provider_info::OLLAMA_CHAT_PROVIDER_REMOVED_ERROR;