[aliencaocao]

Bug: every audit check that collects per-node results through srun runs one worker per node, and each worker prints one JSON record. srun forwards each task's output in 1024-byte chunks and interleaves chunks from different tasks. A record longer than 1024 bytes can arrive split around another node's record, and then neither record parses.

Seen on VP (16 GB300 workers, Slurm 26.05.4): the virtio-net check returned 14 of 16 host records. With the SNAP-4 fields from #111 each record is about 1120 bytes. Raw stdout showed a 2144-byte line (task A's first 1024 bytes followed by task B's whole record) and then A's last 96 bytes on a line of their own. A synthetic 16-task test reproduces it for any line over 1024 bytes and never for lines under it.

Fix:

• slurm_python_command adds --label, so srun delivers each chunk as its own <task>: line.
• New join_srun_labeled_output stitches each task's lines back together. A full 1024-byte chunk continues on that task's next chunk; a shorter one ends the line. A full chunk that already parses as JSON also ends the line, so a line of exactly 1024 bytes isn't merged into the next one. Output that isn't entirely labeled (k8s exec, test stubs) is returned unchanged.
• parse_json_lines runs the join first. That covers platform_config, vboost, storage_config, nic-topology and virtio-net. hbm_memory_exposure and vf-interface-exposure parse srun output with their own loops, so each now calls the join directly.

Testing:

• New tests reproduce the VP split, a 16-task interleave of 3000-byte records, the exactly-1024-byte boundary, unlabeled passthrough, and labeled noise lines.
• On VP, live: 3 runs each of the real virtio-net worker and a 3000-byte synthetic worker across 16 nodes. Every run produced 16 of 16 hosts after reassembly.
• Full suite: 2515 passed. check_public_data passed.

[aliencaocao]

Verified on VP (16× GB300): with this fix the virtio-net/SNAP-4 fan-out returns 16/16 host records; before it, 14/16 (records ~1120 bytes split by srun's 1024-byte chunking).