Replace the Python doc/lint/vocabulary guards with Ludic equivalents that
run through the `x` task runner, so the checks need no Python interpreter:
x check-docs every ```ludic doc fence parses (or is marked)
x check-impl every implemented feature has a docs/language page
x check-vocabulary vocabulary in sync across grammar / lexer / header / parser
x lint-asset <file> validate one editor .json / .xml asset
New fragments: tools/x/json.ludic (a small JSON reader — objects/arrays/
strings with \uXXXX + surrogates/numbers/literals, used by the vocabulary
check's grammar navigation and the asset validator) and tools/x/checks.ludic
(the checks + string helpers + a minimal XML well-formedness validator).
`x test-tools` now runs the vocabulary + docs-coverage checks and the
JSON/XML asset validation through Ludic instead of python3; ci.yml's
docs-coverage step calls `x check-impl` / `x check-vocabulary`. Each port was
verified against its former Python script for exact verdict parity on the
clean tree and on injected drift (a removed keyword, a broken grammar
alternation, an undocumented method).
Deletes the superseded scripts: tools/check-vocabulary.py, tools/check-docs.py,
tools/docgen/check-impl.py, tools/docgen/validate.py. The docgen site
generator (gen.py/check.py/palette.py) and the LSP protocol driver
(test-lsp.py) remain and are tracked separately.
Toolchain unchanged (seed byte-identical); `x test` (56) and `x test-tools`
(29) stay green.
Part of #31
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>