core: trim deferred tool contribution input

codex-rs/core/src/tools/router.rs

@@ -266,7 +266,6 @@ pub(crate) fn extension_tool_executors(
             contributor.tools_for_step(ToolContributionInput {
                 session_store: &session.services.session_extension_data,
                 thread_store: &session.services.thread_extension_data,
-                turn_store: step_context.turn.extension_data.as_ref(),
                 starting_environments: &starting_environments,
             })
         })

codex-rs/ext/extension-api/src/contributors.rs

@@ -239,8 +239,6 @@ pub struct ToolContributionInput<'a> {
     pub session_store: &'a ExtensionData,
     /// Store scoped to this thread runtime.
     pub thread_store: &'a ExtensionData,
-    /// Store scoped to this turn runtime.
-    pub turn_store: &'a ExtensionData,
     /// Selected environments that are still starting for this request.
     pub starting_environments: &'a [Arc<dyn StartingEnvironment>],
 }