`cloud service query --queries-file` rejects multi-statement files that local `client --queries-file` accepts

[sdairs]

Found during 0.4.0 RC cloud-command testing (2026-07-30).

A queries file with more than one statement works with local client --queries-file but fails through cloud service query --queries-file:

$ cat queries.sql
SELECT 1;
SELECT 2;
$ chctl cloud service query --id <id> --queries-file queries.sql
Error: {"error":{"code":"62","details":"Syntax error (Multi-statements are not allowed): failed at position 9 (end of query) (line 1, col 9): ;\nSELECT 2. . "}}
(exit 1)

The Query API rejects multi-statement requests and the CLI sends the whole file as a single request. A single-statement file (and stdin via --queries-file -) works fine.

Options, in preference order:

1. Split the file into statements client-side and send them sequentially (matching local client --queries-file semantics — same flag, same behavior).
2. Failing that, document the single-statement limitation in the service query help and detect the case early with a friendly error instead of the raw API blob.

Error rendering for this path is also poor — tracked separately.