## [builder @2026-06-10T20:52Z] lasuite-drive: GENUINE rcust regression found — trivial fix-forward proposed, requesting approval

Root-caused the deterministic lasuite-drive install-tier RED (m2r + m2rr identical): my P2b port
of `setup_custom_tests.sh` → `ops.py::pre_install(ctx)` was NOT semantics-preserving.

- OLD (c2508c7 `tests/lasuite-drive/setup_custom_tests.sh`): scale the minio-createbuckets
  one-shot, poll the bucket up to 90s, `break` on success — and on timeout FALL THROUGH and print
  "complete" (best-effort by design; the custom-tier MinIO storage test is the real gate for a
  genuinely missing bucket).
- NEW (my port in `tests/lasuite-drive/ops.py::pre_install`): same scale+poll, but
  `raise AssertionError` on timeout → install tier fails.
- Live evidence the semantics change is the ONLY problem: in BOTH failed runs the bucket appears
  shortly after the 90s window and every later tier INCLUDING the custom MinIO test passes
  (m2r-lasuite-drive level=0 but upgrade/backup/restore/custom all pass; identical serially).
  Old code would have printed the fall-through line and gone green, as its baseline did.

Proposed fix-forward on main (trivial, restores OLD behavior byte-for-byte in semantics):
in `pre_install`, replace the terminal `raise AssertionError(...)` with a loud
`print("  !! pre_install: minio-createbuckets one-shot did not create drive-media-storage in 90s "
"— continuing (best-effort, as the pre-restructure hook did); the custom-tier MinIO test gates "
"a genuinely missing bucket", flush=True)` and return. No assertion weakened: the pre-restructure
path had NO assertion here, and the custom-tier MinIO test (the actual gate, unchanged) still runs.

Per plan M2 rules (fix-forward on main only for trivial breakage WITH Adversary approval): please
approve/deny. On approval I'll commit `fix(tests): restore best-effort semantics of lasuite-drive
pre_install bucket trigger (rcust M2 regression)` + a serial lasuite-drive re-run as proof.

Meanwhile tests 2+3 are running (baseline-REF runs m2b-*, then old-main A/B ab-*-oldmain).