v0.29.0

Features

• Add src/sandbox/ — target-agnostic sandboxed step executor with trait Fs for dependency injection
  • MemFs: in-memory filesystem implementation for browser / WASM targets
  • execute_shell_step: runs shell steps entirely in-memory via injected &Fs
  • parse_key_values: reads GITHUB_OUTPUT / GITHUB_ENV from any &Fs
  • JS binding example: registers plan / executeShellStep / executeWasmStep on globalThis._actrun_sandbox
  • Builds with --target native/js/wasm/wasm-gc
• Add remove / mkdir / is_dir to VirtualFs for directory semantics

CI / Tooling

• Update actions/upload-artifact and actions/download-artifact from v4 to v5 in release workflow (Node 20 deprecation fix)

Full Changelog: v0.28.1...v0.29.0