12.5 Status-only responses

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int rsi_respond_status(int fd, const struct rsi_request *req, uint32_t status);

The workhorse. Use it for:

• status-only ops on success — pass status = RSI_OK; and
• any op reporting a non-OK status — a LOOKUP that found nothing, a SET_VALUE that failed a compare-and-swap, a permission error: reply with the appropriate RSI_* status here, whatever the op.

It fails with EINVAL on a bad req, an unknown status, or RSI_OK given for a payload-bearing op (those must use their own helper on success), plus EIO / the write error.

The rule of thumb: on failure, always rsi_respond_status; on success, rsi_respond_status unless the op is one of the five below.

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