ckpool's share-rejection response sets the "error" field to a bare
JSON string ("Stale", "Above target", "Duplicate", ...). The
Stratum mining v1 spec, and every miner firmware that follows it,
expects that field to be a [code, message, traceback] array. AxeOS
parses with cJSON_GetArrayItem after a cJSON_IsArray check, sees a
string, falls back to "unknown error", and the rejection reason
disappears from the dashboard. Bassin / public-pool sends the
array form, which is why those rejections render as "stale" there.
Patch the JSON_ERR macro in stratifier.c to wrap the existing
share_errs[] string in json_pack("[isn]", ...) and add a small
share_err_code() helper mapping ckpool's enum to the standard
Slush stratum codes:
21 stale (SE_STALE, SE_INVALID_JOBID, SE_NTIME_INVALID)
22 duplicate (SE_DUPE)
23 low diff (SE_HIGH_DIFF)
24 unauthorized (SE_NO_USERNAME)
20 other (everything else)
All 14 JSON_ERR call sites in parse_submit pick this up
automatically — no other call site changes needed. Generated with
git diff against the pinned upstream commit so format is correct;
round-trip-tested with git apply --check.
