docs(cuda-oxide): take the tile-library chapter out of the book until the toolkit ships

[nihalpasham]

What this adds

The tile-library chapter leaves the published book until the CUDA toolkit that carries the feature is announced. The code stays.

before: the book describes #[tile_export] and cargo oxide tilelib, which need a toolkit that is not out yet
after:  the chapter, its figure and every mention are out of the book and the READMEs; the command is hidden from --help

What we fixed

• Removed advanced/tile-libraries.md, its figure and the table-of-contents entry.
• The supported-features row for Tile interop keeps the inter-kernel story and points at the tracking issue only.
• The crate tables in the README and the architecture page keep their two rows, since the inventory guard requires every member, but describe the crates without the feature.
• cargo oxide tilelib is hidden from --help, which is what lets the command-reference guard accept the missing row. The command still runs.

Verification

Checked at 1b2011d44:

• ✅ cargo-oxide 268 tests, formatting, book with warnings as errors.
• ✅ Guards: CLI documentation coverage (16 visible subcommands, 3 hidden), crate inventory, source references, book API names, book catalog stamp, book import order, host API paths, SPDX, test matrix, smoketest contract, reserved prefixes, error example status.

Caveats

• The example tilelib_relu and its README stay in the tree; they are not part of the book.
• Reverting this PR restores the chapter as it was.

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