`docs/swarm/sso.md` described a person in a browser. The swarm's other
callers — the telemetry collector, the queue's auth-callout responder, each
hive's agents — hold no session and follow no redirect, and nothing operator-
facing said how they authenticate. Its relying-party table is forge and
matrix, both browser surfaces.
The new section carries what `swarm-authelia.nix` was holding in comments:
one client per hive because identity belongs to the directory, the audience
being that client id rather than a parallel naming scheme, and signed rather
than opaque tokens because the collector verifies offline against
`/jwks.json` while the queue introspects.
It also states the fail-closed rule once, in the place a reader looks before
touching a vhost: an error page answers 200, and `auth_request` reads any 2xx
as access granted. That shape has now appeared three times — this module's
`/api/` prefix and both of victorialogs' routes — which is what makes it
documentation rather than a comment.
The two comment blocks those replace shrink to the part that is genuinely
local: the submodule-typing reason these clients are a definition rather than
an append, and a loud warning against folding the machine prefix back into
`/`. The security warning stays at the site; only its consequence list moves.
Comments 495 -> 465 lines. Option `description` strings are untouched: they
are the source `pkgs.nixosOptionsDoc` renders into the operator's options
reference, so trimming one would delete published documentation rather than a
duplicate.
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