unified-exec: retain PathUri in command events (#28780)

## Why

App-server must report command events containing foreign-platform paths
without changing existing client or rollout path-string formats.

## What changed

- retain `PathUri` through exec command begin/end events
- convert cwd values to `LegacyAppPathString` at the app-server
compatibility boundary
- drop command actions with foreign paths and log them
- serialize rollout-trace cwd values using their inferred native path
representation
- restore Wine coverage for retained Windows cwd values and successful
completion

codex-rs/core/src/tasks/user_shell.rs

@@ -188,7 +188,7 @@ pub(crate) async fn execute_user_shell_command(
                 turn_id: turn_context.sub_id.clone(),
                 started_at_ms: now_unix_timestamp_ms(),
                 command: display_command.clone(),
-                cwd: cwd.clone(),
+                cwd: cwd.clone().into(),
                 parsed_cmd: parsed_cmd.clone(),
                 source: ExecCommandSource::UserShell,
                 interaction_input: None,
@@ -262,7 +262,7 @@ pub(crate) async fn execute_user_shell_command(
                         turn_id: turn_context.sub_id.clone(),
                         completed_at_ms: now_unix_timestamp_ms(),
                         command: display_command.clone(),
-                        cwd: cwd.clone(),
+                        cwd: cwd.clone().into(),
                         parsed_cmd: parsed_cmd.clone(),
                         source: ExecCommandSource::UserShell,
                         interaction_input: None,
@@ -287,7 +287,7 @@ pub(crate) async fn execute_user_shell_command(
                         turn_id: turn_context.sub_id.clone(),
                         completed_at_ms: now_unix_timestamp_ms(),
                         command: display_command.clone(),
-                        cwd: cwd.clone(),
+                        cwd: cwd.clone().into(),
                         parsed_cmd: parsed_cmd.clone(),
                         source: ExecCommandSource::UserShell,
                         interaction_input: None,
@@ -332,7 +332,7 @@ pub(crate) async fn execute_user_shell_command(
                         turn_id: turn_context.sub_id.clone(),
                         completed_at_ms: now_unix_timestamp_ms(),
                         command: display_command,
-                        cwd,
+                        cwd: cwd.into(),
                         parsed_cmd,
                         source: ExecCommandSource::UserShell,
                         interaction_input: None,