handoffNamingLine function
The ONE line that precedes an injected handoff body.
It names the SUCCESSION VERB rather than a hand-performed delete: the
destruction is licensed by "the disc is tracked, so git history is the
archive", and only that verb archives the disc and proves the note reached
HEAD before removing it. PURE.
Implementation
String handoffNamingLine(SeatHandoff handoff) =>
'Handoff ${handoff.relativePath} — act on Resume here, then run the '
'succession verb in this turn.';