nix: finish the current-behaviour comment sweep in touched files

Rewrite the remaining narration in files the previous commit touched:
"moved"/"sat"/"was REMOVED"/"old default" comments in swarm-bao,
swarm-otel, glue-bao-tls, nats-authelia, swarm-controller, swarm-ui,
swarm-otel-service, swarm-authelia-service, the deploy.nix rename table,
hive-ci, hive-forge/service, hive-tls, hyperhive, swarm-nats, swarm.nix
and a few module-eval fixtures, so each says where a thing is or why it
is so now.

Revert the comment edits inside shell script strings in hive-tls,
swarm-nats and the forge token mint to their previous text, so those
generated units are unchanged. The only unit still changing is
swarm-bao-pki (two comment lines in its script). Refs #3902

nix/agent-modules/renamed-options.nix

@@ -93,11 +93,11 @@
       [ "hyperhive" "frontend" "extraFiles" ]
       [ "services" "hyperhive" "agent" "frontend" "extraFiles" ]
     )
-    # `frontend.mergedDist` moved with the rest and deliberately has NO entry:
+    # `frontend.mergedDist` deliberately has NO entry:
     # it is `readOnly` and ./frontend.nix already defines it, and a rename
     # module contributes a *definition* to its target — so a shim for it makes
     # every evaluation fail with "set multiple times". Nothing could have set
-    # it anyway; a reader of the old path now gets "option does not exist",
+    # it anyway; a reader of the old path gets "option does not exist",
     # which says the same thing sooner. Same reasoning as the `hostUsersFile`
     # exclusion in ../host-modules/deploy.nix.
     (lib.mkRenamedOptionModule