v0.45.1

VGI protocol v3 (vgi.v3) fixes: public canonical constraint record builder and decoder; automatic constraint read-profile negotiation; Arrow nullability relaxed automatically for columns no NOT_NULL/PRIMARY KEY record names; SDK-side validation matching the DuckDB extension's ATTACH rules; generated-column rules checked and legacy generated_expression metadata translated; legacy constraint fields deprecated. See the commit log for language-specific fixes.
Java: versioned tables re-own their constraint records (AT VERSION no longer throws); viewCreate override chain restored; capability hooks for hosted and extra catalogs; public virtualGenerated and MacroInfo.of helpers.