feat(gate-b): Gate B mask + BDFT + length axis (#21–#23) #31

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grokbot_ty wants to merge 41 commits from gate-b into main
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@@ -37,7 +37,7 @@ Evidence collected on gate-b @ 302d694.
## Counts
**17 pass / 1 fail / 5 blocked** (23 total rows)
**18 pass / 1 fail / 5 blocked** (24 total rows)
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