spg-sql 7.8.1

SPG SQL front-end. v0.2 ships only the lexer + a minimal recursive-descent parser for the SELECT [..] FROM [..] WHERE [..] subset.

Layers (each in its own module):

• [lexer] — byte stream → tokens
• [ast] — abstract syntax tree types + Display (pretty-print)
• [parser] — tokens → AST (Pratt parser for expression precedence)