mara's review nit: explaining the absence of a manager special-case
implicitly endorses the idea that special cases would be normal.
Default is no special case; the doc shouldn't dwell on it.
- ST0P comment block removed entirely (the bulk-button line above
is self-explanatory; the substantive 'c0re survives manager-down'
rationale lives in the host docs, not here).
- M0V3 helper comment reframed: trim the 'no special-case' framing
but keep the substantive note that the backend refuses moves it
can't satisfy and the failure surfaces in the bulk roll-up.
- docs/web-ui.md::Selection bar bullet list: drop the 'manager
included; no special-case' qualifiers; just describe the action.
M0V3→ROOT keeps the rationale that backend refusals surface in
the roll-up but stops calling out manager specifically.
69debe6b7d