Delete tiktoken-rs (#7018)

codex-rs/core/src/codex.rs

@@ -133,7 +133,6 @@ use codex_protocol::protocol::InitialHistory;
 use codex_protocol::user_input::UserInput;
 use codex_utils_readiness::Readiness;
 use codex_utils_readiness::ReadinessFlag;
-use codex_utils_tokenizer::warm_model_cache;
 
 /// The high-level interface to the Codex system.
 /// It operates as a queue pair where you send submissions and receive events.
@@ -555,9 +554,6 @@ impl Session {
         // Create the mutable state for the Session.
         let state = SessionState::new(session_configuration.clone());
 
-        // Warm the tokenizer cache for the session model without blocking startup.
-        warm_model_cache(&session_configuration.model);
-
         let services = SessionServices {
             mcp_connection_manager: Arc::new(RwLock::new(McpConnectionManager::default())),
             mcp_startup_cancellation_token: CancellationToken::new(),