Spread AbsolutePathBuf (#17792)

Mechanical change to promote absolute paths through code.

codex-rs/hooks/src/user_notification.rs

@@ -81,6 +81,8 @@ pub fn notify_hook(argv: Vec<String>) -> Hook {
 mod tests {
     use anyhow::Result;
     use codex_protocol::ThreadId;
+    use codex_utils_absolute_path::test_support::PathBufExt;
+    use codex_utils_absolute_path::test_support::test_path_buf;
     use pretty_assertions::assert_eq;
     use serde_json::Value;
     use serde_json::json;
@@ -88,11 +90,12 @@ mod tests {
     use super::*;
 
     fn expected_notification_json() -> Value {
+        let cwd = test_path_buf("/Users/example/project");
         json!({
             "type": "agent-turn-complete",
             "thread-id": "b5f6c1c2-1111-2222-3333-444455556666",
             "turn-id": "12345",
-            "cwd": "/Users/example/project",
+            "cwd": cwd.display().to_string(),
             "client": "codex-tui",
             "input-messages": ["Rename `foo` to `bar` and update the callsites."],
             "last-assistant-message": "Rename complete and verified `cargo build` succeeds.",
@@ -104,7 +107,9 @@ mod tests {
         let notification = UserNotification::AgentTurnComplete {
             thread_id: "b5f6c1c2-1111-2222-3333-444455556666".to_string(),
             turn_id: "12345".to_string(),
-            cwd: "/Users/example/project".to_string(),
+            cwd: test_path_buf("/Users/example/project")
+                .display()
+                .to_string(),
             client: Some("codex-tui".to_string()),
             input_messages: vec!["Rename `foo` to `bar` and update the callsites.".to_string()],
             last_assistant_message: Some(
@@ -121,7 +126,7 @@ mod tests {
     fn legacy_notify_json_matches_historical_wire_shape() -> Result<()> {
         let payload = HookPayload {
             session_id: ThreadId::new(),
-            cwd: std::path::Path::new("/Users/example/project").to_path_buf(),
+            cwd: test_path_buf("/Users/example/project").abs(),
             client: Some("codex-tui".to_string()),
             triggered_at: chrono::Utc::now(),
             hook_event: HookEvent::AfterAgent {