feat(core) RequestRule (#9489)

## Summary
Instead of trying to derive the prefix_rule for a command mechanically,
let's let the model decide for us.

## Testing
- [x] tested locally

codex-rs/app-server/Cargo.toml

@@ -56,6 +56,7 @@ axum = { workspace = true, default-features = false, features = [
     "tokio",
 ] }
 base64 = { workspace = true }
+codex-execpolicy = { workspace = true }
 core_test_support = { workspace = true }
 mcp-types = { workspace = true }
 os_info = { workspace = true }

codex-rs/app-server/tests/suite/send_message.rs

@@ -11,6 +11,7 @@ use codex_app_server_protocol::NewConversationResponse;
 use codex_app_server_protocol::RequestId;
 use codex_app_server_protocol::SendUserMessageParams;
 use codex_app_server_protocol::SendUserMessageResponse;
+use codex_execpolicy::Policy;
 use codex_protocol::ThreadId;
 use codex_protocol::models::ContentItem;
 use codex_protocol::models::DeveloperInstructions;
@@ -358,6 +359,8 @@ fn assert_permissions_message(item: &ResponseItem) {
             let expected = DeveloperInstructions::from_policy(
                 &SandboxPolicy::DangerFullAccess,
                 AskForApproval::Never,
+                &Policy::empty(),
+                false,
                 &PathBuf::from("/tmp"),
             )
             .into_text();