fix: rescue failed uploads + cut Space shards 4->2 to stop OOM

feat: self-heal-watchdog + drop shards 6→4 to dodge OOM kill

fix: OOM kill on cpu-basic — drop 16 shards to 6 + slower stagger

fix: REMOVE Mac dependency + boost HF Space to 16 shards + parquet-direct

fix: 8 shards (was 4) + round-robin axentx projects + 3min cooldown

feat: caps 5x bump (94M\u2192293M) + parallel 4-shard bulk ingest