Floor a requested read window at a zero offset and zero lines.
Models occasionally emit degenerate read_file arguments (offset=-1,
limit=0). Clamping offset keeps backends from reporting a line range
that starts before line 1, which ReadResult rejects.
Clamping limit is not sufficient on its own: flooring a negative limit
at 0 produces a zero-length window, which still has no valid
start_line/end_line pair. Callers must additionally treat a returned
limit of 0 as an empty read — see slice_read_response below, or the
equivalent short-circuits in the sandbox and LangSmith backends, which
flag the result with ReadResult.no_lines_requested.
The int() coercion is deliberate and load-bearing, not redundant with the
annotations: offset and limit originate from model-supplied tool
arguments, and the sandbox backend interpolates them into the source of a
script it executes (_READ_COMMAND_TEMPLATE). Do not remove it.
Requested 0-indexed line offset.
Requested maximum number of lines.
