Why: The approved stage-four design needs reviewable ownership, sequencing, and tests before new X3 product code can start.
Evidence: TT-N03 and TT-R01 stage-three approval; stage-four approval call_a6853c4232f34285a6cbae19dfbeeec5; document checker SELF receipt f4a4cdde2d3ad9b250742da764455a1304e1e26f07270da4f0d37ad6ed8b6c7e.
Impact: Record the stage-five amendment for human review; keep the original 28-item plan and approved implementation active.
Refs: TT-N03, TT-R01; work observation and risk stage-five amendment r1
weichen
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