[codex-analytics] feature plumbing and emittance (#16640)

---
[//]: # (BEGIN SAPLING FOOTER)
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with [ReviewStack](https://reviewstack.dev/openai/codex/pull/16640).
* #16870
* #16706
* #16641
* __->__ #16640

codex-rs/app-server/tests/common/config.rs

@@ -78,3 +78,31 @@ model_provider = "{model_provider_id}"
         ),
     )
 }
+
+pub fn write_mock_responses_config_toml_with_chatgpt_base_url(
+    codex_home: &Path,
+    server_uri: &str,
+    chatgpt_base_url: &str,
+) -> std::io::Result<()> {
+    let config_toml = codex_home.join("config.toml");
+    std::fs::write(
+        config_toml,
+        format!(
+            r#"
+model = "mock-model"
+approval_policy = "never"
+sandbox_mode = "read-only"
+chatgpt_base_url = "{chatgpt_base_url}"
+
+model_provider = "mock_provider"
+
+[model_providers.mock_provider]
+name = "Mock provider for test"
+base_url = "{server_uri}/v1"
+wire_api = "responses"
+request_max_retries = 0
+stream_max_retries = 0
+"#
+        ),
+    )
+}

codex-rs/app-server/tests/common/lib.rs

@@ -14,6 +14,7 @@ pub use auth_fixtures::encode_id_token;
 pub use auth_fixtures::write_chatgpt_auth;
 use codex_app_server_protocol::JSONRPCResponse;
 pub use config::write_mock_responses_config_toml;
+pub use config::write_mock_responses_config_toml_with_chatgpt_base_url;
 pub use core_test_support::format_with_current_shell;
 pub use core_test_support::format_with_current_shell_display;
 pub use core_test_support::format_with_current_shell_display_non_login;

codex-rs/app-server/tests/common/mcp_process.rs

@@ -102,12 +102,17 @@ pub struct McpProcess {
 }
 
 pub const DEFAULT_CLIENT_NAME: &str = "codex-app-server-tests";
+const DISABLE_MANAGED_CONFIG_ENV_VAR: &str = "CODEX_APP_SERVER_DISABLE_MANAGED_CONFIG";
 
 impl McpProcess {
     pub async fn new(codex_home: &Path) -> anyhow::Result<Self> {
         Self::new_with_env_and_args(codex_home, &[], &[]).await
     }
 
+    pub async fn new_without_managed_config(codex_home: &Path) -> anyhow::Result<Self> {
+        Self::new_with_env(codex_home, &[(DISABLE_MANAGED_CONFIG_ENV_VAR, Some("1"))]).await
+    }
+
     pub async fn new_with_args(codex_home: &Path, args: &[&str]) -> anyhow::Result<Self> {
         Self::new_with_env_and_args(codex_home, &[], args).await
     }