Supply Chain & Buildability - Can It Be Built at Fleet Rate

The compact breeder's buildability on engineering grounds (cost held internal): the longest-lead item is 90%-enriched lithium-6, but the neutronics meet the breeding target at 30–60 at% ⁶Li — moving the hardest item off the critical path. The centrepost is a scheduled-replacement cartridge on a ~10–15 unit/yr line, converting a manufacturing risk into a production-rate spec.