v0.3.5

Fixed

• describe_table failed outright in 0.3.4 when the one-row estimate probe
  was refused (GizmoSQL's system-managed instrumentation catalog is
  admin-only). A refused probe now leaves estimated_rows as null.

Added

• The schema-dialect unit test now compiles every advertised tool schema
  with a 2020-12-only Ajv validator, the same check that rejected
  run_query in Claude Desktop, with a draft-07 control that must fail.