v0.19.0: Connections That Know They're Production, Columns That Keep Secrets, and Tables Without a Primary Key You Can Finally Edit

v0.19.0 adds colored tags and environment classification with a production write guard, masks sensitive columns in the results grid, makes tables without a primary key editable, closes the plugin driver feature gap with BLOB and materialized-view forwarding plus plugin-owned connection fields, validates plugin archives before they can touch an existing install, and stops bundling libwayland in the Linux AppImage.