chore: clean up argument-comment lint and roll out all-target CI on macOS (#16054)

## Why

`argument-comment-lint` was green in CI even though the repo still had
many uncommented literal arguments. The main gap was target coverage:
the repo wrapper did not force Cargo to inspect test-only call sites, so
examples like the `latest_session_lookup_params(true, ...)` tests in
`codex-rs/tui_app_server/src/lib.rs` never entered the blocking CI path.

This change cleans up the existing backlog, makes the default repo lint
path cover all Cargo targets, and starts rolling that stricter CI
enforcement out on the platform where it is currently validated.

## What changed

- mechanically fixed existing `argument-comment-lint` violations across
the `codex-rs` workspace, including tests, examples, and benches
- updated `tools/argument-comment-lint/run-prebuilt-linter.sh` and
`tools/argument-comment-lint/run.sh` so non-`--fix` runs default to
`--all-targets` unless the caller explicitly narrows the target set
- fixed both wrappers so forwarded cargo arguments after `--` are
preserved with a single separator
- documented the new default behavior in
`tools/argument-comment-lint/README.md`
- updated `rust-ci` so the macOS lint lane keeps the plain wrapper
invocation and therefore enforces `--all-targets`, while Linux and
Windows temporarily pass `-- --lib --bins`

That temporary CI split keeps the stricter all-targets check where it is
already cleaned up, while leaving room to finish the remaining Linux-
and Windows-specific target-gated cleanup before enabling
`--all-targets` on those runners. The Linux and Windows failures on the
intermediate revision were caused by the wrapper forwarding bug, not by
additional lint findings in those lanes.

## Validation

- `bash -n tools/argument-comment-lint/run.sh`
- `bash -n tools/argument-comment-lint/run-prebuilt-linter.sh`
- shell-level wrapper forwarding check for `-- --lib --bins`
- shell-level wrapper forwarding check for `-- --tests`
- `just argument-comment-lint`
- `cargo test` in `tools/argument-comment-lint`
- `cargo test -p codex-terminal-detection`

## Follow-up

- Clean up remaining Linux-only target-gated callsites, then switch the
Linux lint lane back to the plain wrapper invocation.
- Clean up remaining Windows-only target-gated callsites, then switch
the Windows lint lane back to the plain wrapper invocation.

codex-rs/core/tests/suite/realtime_conversation.rs

@@ -172,7 +172,11 @@ async fn conversation_start_audio_text_close_round_trip() -> Result<()> {
 
     let mut builder = test_codex();
     let test = builder.build_with_websocket_server(&server).await?;
-    assert!(server.wait_for_handshakes(1, Duration::from_secs(2)).await);
+    assert!(
+        server
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
+            .await
+    );
 
     test.codex
         .submit(Op::RealtimeConversationStart(ConversationStartParams {
@@ -310,7 +314,11 @@ async fn conversation_start_uses_openai_env_key_fallback_with_chatgpt_auth() ->
 
     let mut builder = test_codex().with_auth(CodexAuth::create_dummy_chatgpt_auth_for_testing());
     let test = builder.build_with_websocket_server(&server).await?;
-    assert!(server.wait_for_handshakes(1, Duration::from_secs(2)).await);
+    assert!(
+        server
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
+            .await
+    );
 
     test.codex
         .submit(Op::RealtimeConversationStart(ConversationStartParams {
@@ -365,7 +373,11 @@ async fn conversation_transport_close_emits_closed_event() -> Result<()> {
 
     let mut builder = test_codex();
     let test = builder.build_with_websocket_server(&server).await?;
-    assert!(server.wait_for_handshakes(1, Duration::from_secs(2)).await);
+    assert!(
+        server
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
+            .await
+    );
 
     test.codex
         .submit(Op::RealtimeConversationStart(ConversationStartParams {
@@ -572,7 +584,11 @@ async fn conversation_second_start_replaces_runtime() -> Result<()> {
     .await;
     let mut builder = test_codex();
     let test = builder.build_with_websocket_server(&server).await?;
-    assert!(server.wait_for_handshakes(1, Duration::from_secs(2)).await);
+    assert!(
+        server
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
+            .await
+    );
 
     test.codex
         .submit(Op::RealtimeConversationStart(ConversationStartParams {
@@ -672,7 +688,7 @@ async fn conversation_uses_experimental_realtime_ws_base_url_override() -> Resul
     let test = builder.build_with_websocket_server(&startup_server).await?;
     assert!(
         startup_server
-            .wait_for_handshakes(1, Duration::from_secs(2))
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
             .await
     );
 
@@ -724,7 +740,11 @@ async fn conversation_uses_experimental_realtime_ws_backend_prompt_override() ->
         config.experimental_realtime_ws_backend_prompt = Some("prompt from config".to_string());
     });
     let test = builder.build_with_websocket_server(&server).await?;
-    assert!(server.wait_for_handshakes(1, Duration::from_secs(2)).await);
+    assert!(
+        server
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
+            .await
+    );
 
     test.codex
         .submit(Op::RealtimeConversationStart(ConversationStartParams {
@@ -784,7 +804,7 @@ async fn conversation_uses_experimental_realtime_ws_startup_context_override() -
     fs::write(test.workspace_path("README.md"), "workspace marker")?;
     assert!(
         startup_server
-            .wait_for_handshakes(1, Duration::from_secs(2))
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
             .await
     );
 
@@ -844,7 +864,7 @@ async fn conversation_disables_realtime_startup_context_with_empty_override() ->
     fs::write(test.workspace_path("README.md"), "workspace marker")?;
     assert!(
         startup_server
-            .wait_for_handshakes(1, Duration::from_secs(2))
+            .wait_for_handshakes(/*expected*/ 1, Duration::from_secs(2))
             .await
     );
 
@@ -1238,7 +1258,9 @@ async fn conversation_handoff_persists_across_item_done_until_turn_complete() ->
     })
     .await;
 
-    let first_append = realtime_server.wait_for_request(0, 1).await;
+    let first_append = realtime_server
+        .wait_for_request(/*connection_index*/ 0, /*request_index*/ 1)
+        .await;
     assert_eq!(
         first_append.body_json()["type"].as_str(),
         Some("conversation.handoff.append")
@@ -1262,7 +1284,9 @@ async fn conversation_handoff_persists_across_item_done_until_turn_complete() ->
 
     let _ = gate_second_message_tx.send(());
 
-    let second_append = realtime_server.wait_for_request(0, 2).await;
+    let second_append = realtime_server
+        .wait_for_request(/*connection_index*/ 0, /*request_index*/ 2)
+        .await;
     assert_eq!(
         second_append.body_json()["type"].as_str(),
         Some("conversation.handoff.append")
@@ -1777,7 +1801,9 @@ async fn delegated_turn_user_role_echo_does_not_redelegate_and_still_forwards_au
         "delegate now"
     );
 
-    let mirrored_request = realtime_server.wait_for_request(0, 1).await;
+    let mirrored_request = realtime_server
+        .wait_for_request(/*connection_index*/ 0, /*request_index*/ 1)
+        .await;
     let mirrored_request_body = mirrored_request.body_json();
     eprintln!(
         "[realtime test +{}ms] saw mirrored request type={:?} handoff_id={:?} text={:?}",