Manual (modes.rst) and README: install the extension from Open VSX in
VSCodium/Cursor/etc., and as a .vsix by hand in Microsoft VSCode; note
that testium must be on PATH or set via testium.serverPath.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
modes.rst: new 'Language server (editor support)' section — testium lsp /
testium schema, the testium_assist client, the [lsp] extra. tum_syntax.rst:
a note on parameter validation (unknown-key warning, missing-required error).
Builds clean (sphinx html, no RST errors).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
