ensure_hive_space relied solely on the persisted room-id file. If that file
is ever lost (a full /var/lib/hyperhive wipe), the next sweep blind-creates a
new m.space — the homeserver keeps the old one, so duplicate hive spaces
accumulate (observed: multiple 'hive'/'pr1ma' rooms on the live instance).
Anchor the Space to a stable canonical alias #hive:<server>:
- fast path (room-id file present): reuse it and heal the alias mapping so
it keeps pointing at the canonical room
- no file: resolve #hive:<server> and adopt the existing room if present,
re-persisting the file — recovers the space after a wipe instead of
duplicating it
- only create (with the alias) when neither yields a room
server_name is now discovered before ensure_hive_space in ensure_all and
threaded through (the alias needs it). Existing deployments heal the alias
onto their current space on the next sweep; no new room is created when the
file is present.
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