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/app-server/src/request_processors.rs

@@ -553,8 +553,7 @@ fn resolve_turn_environment_selections(
         let environment_id = environment.environment_id;
         let cwd = environment
             .cwd
-            .infer_absolute_path_convention()
-            .and_then(|convention| environment.cwd.to_path_uri(convention).ok())
+            .to_inferred_path_uri()
             .ok_or_else(|| {
                 invalid_request(format!(
                     "invalid cwd for environment `{environment_id}`: path `{}` does not use absolute POSIX or Windows path syntax",