Verify: View support

[debba]

Description

Verify that view-related operations work correctly against a real Db2 instance.

Methods to verify

• get_views — list views in a schema
• get_view_definition — return the stored view definition
• get_view_columns — return column metadata for a view

Acceptance criteria

• Views are correctly listed
• View definitions are returned accurately
• View column metadata matches the actual view structure

Part of the WIP verification checklist in README.