Remove config lockfile support (#38011)

## What changed

- Remove effective-config lockfile export, replay, and validation from session startup.
- Remove the `debug.config_lockfile` settings and generated schema entries.
- Remove feature-config materialization helpers that were only used to create lockfiles.

GitOrigin-RevId: a8c07c1c06325b3ec3dae9a97c36c2488d37df25

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

@@ -204,7 +204,6 @@ use codex_protocol::error::Result as CodexResult;
 use codex_protocol::exec_output::StreamOutput;
 
 mod code_mode_warning;
-mod config_lock;
 pub(crate) mod context_window;
 mod extension_metrics;
 mod handlers;
@@ -227,8 +226,6 @@ pub(crate) mod turn;
 pub(crate) mod turn_context;
 mod world_state;
 use self::code_mode_warning::unsupported_code_mode_warning;
-use self::config_lock::export_config_lock_if_configured;
-use self::config_lock::validate_config_lock_if_configured;
 #[cfg(test)]
 use self::handlers::submission_dispatch_span;
 use self::handlers::submission_loop;
@@ -683,11 +680,6 @@ impl Session {
             .get_model_info(model.as_str(), &config.to_models_manager_config())
             .await;
         let configured_config = Arc::clone(&config);
-        if config.config_lock_export_dir.is_some()
-            && config.config_lock_save_fields_resolved_from_model_catalog
-        {
-            self::token_budget::apply_model_defaults(Arc::make_mut(&mut config), &model_info);
-        }
         let multi_agent_version = config.multi_agent_version_override().or_else(|| {
             resolve_multi_agent_version(&conversation_history, inherited_multi_agent_version)
         });
@@ -735,7 +727,6 @@ impl Session {
             developer_instructions: config.developer_instructions.clone(),
             personality: config.personality,
             base_instructions,
-            compact_prompt: config.compact_prompt.clone(),
             approval_policy: config.permissions.approval_policy.clone(),
             approvals_reviewer: config.approvals_reviewer,
             permission_profile_state: session_permission_profile_state_from_config(&config)?,