chore: bump version to 0.2.2

Release v0.2.2 includes:
- Fix: PTY prompt detection (removed \r\e[2K escape sequence)
- Fix: ReadFiles handler using real implementation
- Fix: ContextSave skips binary files gracefully
- CI: Upgraded to stable Rust and GitHub Actions v6
- Deps: Updated criterion 0.8, directories 6.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: gabrielmaialva33

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "winx-code-agent"
-version = "0.2.1"
+version = "0.2.2"
 edition = "2021"
 rust-version = "1.75"
 description = "High-performance Rust implementation of WCGW for LLM code agents"