m3sep_test.ww drives the raw w6c/w6a/w6l toolchains (+_ww twins) over
hand-composed //ww:module units splicing produced .wwi bytes: the
bodies==.wwi keystone on both stages per package (mid/root/smid) with
determinism, rule-10 and the value-global DATA guard; the end-to-end
i32 chain (exit 59) with final-exe byte-id; and the #49 str-label /
#53 export-leaf link legs (exits 160/140) with their .s needle
proofs. Each @test re-produces its .wwi cold instead of sharing the
carrier's single scratch dir (same claims, sharper isolation).
Hojun-Cho
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