Before M4 deletes the combined.ww embedding (byte-id-moving), capture a
golden record of the combined codegen oracle while both build paths still
exist. The manifest pins the md5 of the combined-path .s emitted by the
pinned w6c_ww for the five bootstrap targets, plus the five combined-epoch
binary md5s, with a regen procedure. Re-derivable from the m4-combined-epoch
tag, so a future sep-path regression stays drift-checkable against
last-known-good combined output.
Data-only; the five wwstage binary pins are unchanged.
Hojun-Cho
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