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/exec/src/event_processor_with_human_output.rs

@@ -68,10 +68,9 @@ impl EventProcessorWithHumanOutput {
         match item {
             ThreadItem::CommandExecution { command, cwd, .. } => {
                 eprintln!(
-                    "{}\n{} in {}",
+                    "{}\n{} in {cwd}",
                     "exec".style(self.italic).style(self.magenta),
                     command.style(self.bold),
-                    cwd.display()
                 );
             }
             ThreadItem::McpToolCall { server, tool, .. } => {