SQLite SQL compiler. Implements storage.Compiler (DML) and ddl.Compiler (DDL) —
translates storage.Query/ddl.Stmt into SQLite SQL. ExportDDL builds full-schema
SQL (ordered via ddl.TopologicalSort) for build-time schema generation. Pure compiler:
no connections, no execution — see tinywasm/sqlite for the driver that wraps a real
*sql.DB in a storage.Conn.