Gate the tombstone+notify on "a live default gateway has recorded a served set"
(recorded_served_profiles() is not None) rather than on the per-profile
_served_by_running_multiplexer probe: a multiplexer serves every dir under
profiles/, the signal is cheap, and the narrower probe falls back to config
derivation the CLI process cannot see. Trim the salvaged tests to two
invariants — ordering (unroute while the old home still exists and a stale
mkdir_under_hermes_home of it is refused; hot-serve after the move; no
tombstone left) and no-signal-without-multiplexer. Rollback on a failed move is
kept and covered by the same code path.
Builds on #109269 (xielevi). Fixes#109267.
teknium1
a7254e2d4c