Spread AbsolutePathBuf (#17792)

Mechanical change to promote absolute paths through code.

codex-rs/app-server/src/thread_status.rs

@@ -10,8 +10,6 @@ use codex_app_server_protocol::ThreadStatus;
 use codex_app_server_protocol::ThreadStatusChangedNotification;
 use codex_protocol::ThreadId;
 use std::collections::HashMap;
-#[cfg(test)]
-use std::path::PathBuf;
 use std::sync::Arc;
 use tokio::sync::Mutex;
 #[cfg(test)]
@@ -455,6 +453,8 @@ fn loaded_thread_status(runtime: &RuntimeFacts) -> ThreadStatus {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use codex_utils_absolute_path::test_support::PathBufExt;
+    use codex_utils_absolute_path::test_support::test_path_buf;
     use pretty_assertions::assert_eq;
     use tokio::time::Duration;
     use tokio::time::timeout;
@@ -895,7 +895,7 @@ mod tests {
             updated_at: 0,
             status: ThreadStatus::NotLoaded,
             path: None,
-            cwd: PathBuf::from("/tmp"),
+            cwd: test_path_buf("/tmp").abs(),
             cli_version: "test".to_string(),
             agent_nickname: None,
             agent_role: None,