[AkiSakurai]

The docs command has a regression where it outputs incomplete types. The generated documentation on https://docs.werwolv.net/pattern-language/libraries/type/base.pat renders the template type aliases as

using Dec<T> = ??? [[format(...)]];;

while the actual declaration is

using Dec<T> = T [[format("type::impl::format_dec")]];

Template parameter references print as '???' and attribute arguments are dropped entirely. This broke when type applications (ASTNodeTypeApplication) were introduced in #204: the docs generator was ported to the new node but never learned to print its template arguments. Before #204 the same declaration still rendered the complete

using Dec<T> = T [[format]];

with only the attribute arguments missing.

• Split docs type helpers into docs_types.cpp (no CLI11 dependency for tests)
• Implement expression and type name stringification as ASTStringifier, a visitor built on the AST visitor framework instead of dynamic_cast dispatch
• Add stringifyTypeName/stringifyExpression with parent template param resolution
• Precedence-aware parenthesization for math/ternary/cast expressions
• Angle-bracket ambiguity parens for < > <= >= >> in template args
• Preserve endianness (be/le) inside and outside template arguments
• Keep unsigned literal suffixes (0u) in docs output so it round-trips back to the same literal; pattern type names keep their previous display format
• Only fold "0 expr" back into unary "x" for the parser's signed-zero encoding, so a user-written "0u - x" keeps its value
• Print attribute arguments via stringifyExpression (e.g. [[pack(1)]])
• Skip invalid type decls in docs generation
• Expand UsingDocs test coverage