Precompute app-server protocol exports (#36212)

## Why

Normal app-server protocol builds do not need the `ts-rs` and `schemars`
implementations used to generate schema exports.

## What changed

- Embed compressed stable and experimental TypeScript and JSON schema exports,
  and serve the existing export APIs from those artifacts.
- Use no-op schema derives in non-test builds while keeping the real generators
  available for fixture regeneration and tests.
- Move schema fixture regeneration behind a Python helper and update
  `just write-app-server-schema --experimental` to refresh the experimental
  embedded exports.

## Testing

- Verify embedded exports match freshly generated stable and experimental
  schemas.
- Verify export options and on-disk output remain compatible.

GitOrigin-RevId: e8536338b457e6eec34bdf29ec0684144bd13734

codex-rs/app-server-protocol/src/protocol/v2/shared.rs

@@ -1,3 +1,5 @@
+use crate::JsonSchema;
+use crate::TS;
 use codex_experimental_api_macros::ExperimentalApi;
 use codex_protocol::config_types::ApprovalsReviewer as CoreApprovalsReviewer;
 use codex_protocol::config_types::SandboxMode as CoreSandboxMode;
@@ -5,16 +7,20 @@ use codex_protocol::protocol::AskForApproval as CoreAskForApproval;
 use codex_protocol::protocol::CodexErrorInfo as CoreCodexErrorInfo;
 use codex_protocol::protocol::GranularApprovalConfig as CoreGranularApprovalConfig;
 use codex_protocol::protocol::NonSteerableTurnKind as CoreNonSteerableTurnKind;
-use schemars::JsonSchema;
+#[cfg(test)]
 use schemars::r#gen::SchemaGenerator;
+#[cfg(test)]
 use schemars::schema::InstanceType;
+#[cfg(test)]
 use schemars::schema::Metadata;
+#[cfg(test)]
 use schemars::schema::Schema;
+#[cfg(test)]
 use schemars::schema::SchemaObject;
 use serde::Deserialize;
 use serde::Serialize;
+#[cfg(test)]
 use serde_json::Value as JsonValue;
-use ts_rs::TS;
 
 // Macro to declare a camelCased API v2 enum mirroring a core enum which
 // tends to use either snake_case or kebab-case.
@@ -236,6 +242,7 @@ pub enum ApprovalsReviewer {
     AutoReview,
 }
 
+#[cfg(test)]
 impl JsonSchema for ApprovalsReviewer {
     fn schema_name() -> String {
         "ApprovalsReviewer".to_string()
@@ -249,6 +256,7 @@ impl JsonSchema for ApprovalsReviewer {
     }
 }
 
+#[cfg(test)]
 fn string_enum_schema_with_description(values: &[&str], description: &str) -> Schema {
     let mut schema = SchemaObject {
         instance_type: Some(InstanceType::String.into()),