shiki v0.4.1

Added

• shiki-core/shiki-config/shiki-tui/shiki-cli are now published to crates.io — CARGO_REGISTRY_TOKEN is configured, so cargo install shiki-cli works directly, no --git/--path needed. This is the release that verifies the publish-crates job actually publishes for real (previous tags skipped it since the secret wasn't set yet).