[codex] Fix t4a CubeCL xtask selectors

[shinaoka]

Summary

• Update xtask package selectors from old CubeCL package names to the new t4a-cubecl* package names.
• Drop SPIR-V custom checks from the minimal tensor4all publish fork path because cubecl-spirv is intentionally not part of the published closure.

Root cause

The t4a package rename changed Cargo package names while preserving Rust crate import names. CI xtask commands still selected old package names such as cubecl-wgpu, causing code-quality to fail after #8 merged.

Verification

• cargo xtask check audit
• cargo fmt --all --check
• cargo xtask check format
• cargo xtask check lint