Resolves the 06-vs-08 contradiction: 06's Lanework External fallback
demotes on true deletions only (id vanished from the board, per the
message engine's whole-board id matching), not folder moves. A bare mv
leaves the moved card unstamped, so 08 now teaches re-stamping on every
move as well as every write.
Claude-Session: https://claude.ai/code/session_01HJ7PhFNmQ19bvy9RMD6GSb