/ultrareview returns empty findings array, consumes quota

On 2026-05-09 ran /ultrareview 3 times in a row on a 1930-file diff
(82,312 insertions / 497,210 deletions, branch feat/icp-to-solana-migration).

Each run completed in ~5-10 min and reported task status completed,
but the findings payload was empty [] for all 3 runs.

Sessions:

• session_01MTovTmFb5xR77eVZtbZjz6
• session_012tERwYiSiyqTMDQcvwJE4Z
• session_017Vbp11TY6vX6beeTiyPxvL

Free quota (3 of 3) consumed. Diff size + complexity make 0 findings
impossible — clear platform bug on findings serialisation or the
review pipeline returning a stale empty result.

Request: refund the 3 free runs and investigate the empty-payload regression.