A 2.16× regression, root-caused and reversed in a day

A de-fused CallMethod lowering spikes the headline to 2.157× Node and drifts 24 Test262 rows; both are traced to one commit and reversed.

The capture on 29 August came in at 2.157× Node on the headline ten, from 0.965× the day before. The cause was 85fca98a, which de-fused the CallMethod lowering; e2250fca separately traced a 24-row Test262 drift to the same change. 271647ad reversed it (0.977× headline, 0.665× all 13). The same call-order question came back in September as B280, this time resolved in favour of correctness and with the cost measured.