Revert "Add skill approval event/response (#12633)" (#12811)

This reverts commit https://github.com/openai/codex/pull/12633. We no
longer need this PR, because we favor sending normal exec command
approval server request with `additional_permissions` of skill
permissions instead

codex-rs/protocol/src/protocol.rs

@@ -41,7 +41,6 @@ use crate::openai_models::ReasoningEffort as ReasoningEffortConfig;
 use crate::parse_command::ParsedCommand;
 use crate::plan_tool::UpdatePlanArgs;
 use crate::request_user_input::RequestUserInputResponse;
-use crate::skill_approval::SkillApprovalResponse;
 use crate::user_input::UserInput;
 use codex_utils_absolute_path::AbsolutePathBuf;
 use schemars::JsonSchema;
@@ -62,7 +61,6 @@ pub use crate::approvals::NetworkApprovalProtocol;
 pub use crate::approvals::NetworkPolicyAmendment;
 pub use crate::approvals::NetworkPolicyRuleAction;
 pub use crate::request_user_input::RequestUserInputEvent;
-pub use crate::skill_approval::SkillRequestApprovalEvent;
 
 /// Open/close tags for special user-input blocks. Used across crates to avoid
 /// duplicated hardcoded strings.
@@ -296,14 +294,6 @@ pub enum Op {
         response: DynamicToolResponse,
     },
 
-    /// Resolve a skill approval request.
-    SkillApproval {
-        /// Item id for the in-flight request.
-        id: String,
-        /// User decision.
-        response: SkillApprovalResponse,
-    },
-
     /// Append an entry to the persistent cross-session message history.
     ///
     /// Note the entry is not guaranteed to be logged if the user has
@@ -1056,8 +1046,6 @@ pub enum EventMsg {
 
     DynamicToolCallResponse(DynamicToolCallResponseEvent),
 
-    SkillRequestApproval(SkillRequestApprovalEvent),
-
     ElicitationRequest(ElicitationRequestEvent),
 
     ApplyPatchApprovalRequest(ApplyPatchApprovalRequestEvent),