Add ST Grammar#1
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Several places where the IEC grammar reduces a bare identifier through multiple aliased or overlapping rules (type vs. function-block names, derived type-name variants, access-path segments) are genuinely ambiguous from syntax alone - which one applies is only decidable with a symbol table - so those spots are collapsed onto the existing shared `type_name`/`symbolic_variable` rules instead, deferring the distinction to a later semantic pass. Other conflicts are fixed more locally: - signed_integer/real_literal fold their optional sign into the token regex so tree-sitter's longest-match lexing picks them over a bare unary-minus operator. - bit_string_literal requires its type prefix, since an unprefixed integer was ambiguous with a plain integer literal. - character_string (used where no STRING/WSTRING keyword disambiguates) is now a single unaliased rule instead of a single-vs-double-byte choice that shared the same delimiter and representation set. - param_assignment's `NOT var_name => var` vs. unary_operator's `NOT expr` is a genuine local ambiguity (resolvable with more lookahead, not by restructuring), so it's handed to GLR via `%conflicts`. Also drops fb_name_decl, made dead by the type_name consolidation.
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Add ST Grammar