Examples: ``say Hello``, ``gamemode creative Steve``, ``tp Steve 0 64 0``

Useful for commands whose feedback appears in the server log rather than the
RCON response (e.g. plugin commands that print results via logger).

Args:
    command: The Minecraft command to execute.
    wait_seconds: Seconds to wait for log output after execution (default 2).

Args:
    lines: Number of lines to read from the end of the log (default 50).

Only lines containing the configured LOG_PREFIX (default ``[TEST]``) are
returned.  Supports incremental reading: pass the ``position`` value from a
previous call as ``since_position`` to only get new entries.

Args:
    since_position: Byte offset to start reading from (0 = beginning).
    event_filter: Optional event type filter (e.g. ``PASS``, ``FAIL``,
        ``SUMMARY``).  Only lines matching ``{prefix} {event_filter}`` are
        returned.

Write operations (INSERT, UPDATE, DELETE, DROP, etc.) are blocked.  Results
are returned as a formatted ASCII table.

Args:
    sql: A SELECT SQL statement.

Recommended to call before running tests or debugging.