[aersam]

Fixes #56

SqlQueryNoTemplate (and so SqlQuery, used by fetch_all/fetch_one/fetch_scalar/execute/PostgresJsonResponse) now accepts any sqlglot exp.Expr instead of exp.Expression. In sqlglot 30 exp.Query (base of Select/Union/Subquery) is an exp.Expr but not an exp.Expression, so a type checker such as pyright rejected exp.Query-typed values. The exp import stays under TYPE_CHECKING (sqlglot is still not imported by import pgdevkit.db).

• Runtime tests: Union/Subquery through _render, PostgresJsonResponse and live fetch_all; nested exp.Command / invalid placeholder names are still rejected.
• Docs: README/SKILL.md wording, comment on the alias explaining why it is exp.Expr.
• Version 0.15.2.

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