Companion to the local split of docs/HANDOFF.md (gitignored rolling
working file — that half of the move is working-tree-only, backed up in
the pre-edit snapshot). Appends lines 137-5764 of the pre-split HANDOFF
(### ARCHIVE — M-140 onward, ~444 KB) after the existing M-2/M-3 brief,
with a divider documenting coverage and the newest-first ordering of
the moved block. Content verbatim; CRLF->LF normalised to match this
file and .gitattributes (eol=lf). Verified: live head + moved chunk
rejoin byte-identical to the original (CR-stripped); appended region
cmp-clean against the snapshot.
Archive intro corrected: it claimed 'through session M-11' but held only
M-2/M-3; the M-4-M-11 gap is pre-existing, noted as such.