- cli/commands/query.py: --stdin mode now reads register_bq from the
JSON payload and merges it into the register_bq option list, matching
the documented {"register_bq": {...}, "sql": "..."} contract.
- src/remote_query.py: add _validate_bq_sql() with a narrower blocklist
(writes only); register_bq() now calls _validate_bq_sql() so legitimate
BQ operations like INFORMATION_SCHEMA, CALL, IMPORT are not blocked.
The final DuckDB execute() path still uses the full _validate_sql().
- tests/test_remote_query.py: add TestValidateBqSql covering allowed
INFORMATION_SCHEMA queries and blocked write operations.
2ad8828f8c