feat: Enhance executable resolution by refreshing PATH (#1098)

* Refresh path on executable lookup

* Make resolve_executable_path async

* Handle task attempt start failure gracefully

* clippy fix

* Remove unused to_shell_string

* Lint

---------

Co-authored-by: Alex Netsch <alex@bloop.ai>

crates/executors/Cargo.toml

@@ -48,3 +48,6 @@ codex-app-server-protocol = { git = "https://github.com/openai/codex.git", packa
 codex-mcp-types = { git = "https://github.com/openai/codex.git", package = "mcp-types", rev = "488ec061bf4d36916b8f477c700ea4fde4162a7a" }
 sha2 = "0.10"
 derivative = "2.2.0"
+
+[target.'cfg(windows)'.dependencies]
+winsplit = "0.1.0"