Removed experimental "command risk assessment" feature (#7799)

This experimental feature received lukewarm reception during internal
testing. Removing from the code base.

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

@@ -7,7 +7,6 @@
 use crate::codex::Session;
 use crate::codex::TurnContext;
 use crate::error::CodexErr;
-use crate::protocol::SandboxCommandAssessment;
 use crate::protocol::SandboxPolicy;
 use crate::sandboxing::CommandSpec;
 use crate::sandboxing::SandboxManager;
@@ -20,7 +19,6 @@ use std::collections::HashMap;
 use std::fmt::Debug;
 use std::hash::Hash;
 use std::path::Path;
-use std::path::PathBuf;
 
 use futures::Future;
 use futures::future::BoxFuture;
@@ -84,7 +82,6 @@ pub(crate) struct ApprovalCtx<'a> {
     pub turn: &'a TurnContext,
     pub call_id: &'a str,
     pub retry_reason: Option<String>,
-    pub risk: Option<SandboxCommandAssessment>,
 }
 
 // Specifies what tool orchestrator should do with a given tool call.
@@ -219,17 +216,6 @@ pub(crate) struct ToolCtx<'a> {
     pub tool_name: String,
 }
 
-/// Captures the command metadata needed to re-run a tool request without sandboxing.
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub(crate) struct SandboxRetryData {
-    pub command: Vec<String>,
-    pub cwd: PathBuf,
-}
-
-pub(crate) trait ProvidesSandboxRetryData {
-    fn sandbox_retry_data(&self) -> Option<SandboxRetryData>;
-}
-
 #[derive(Debug)]
 pub(crate) enum ToolError {
     Rejected(String),