Per review: `deploy.otel` does not imply swarm level, and there is a
hive-tier collector too -- `services.hyperhive.otel.enable`, which every
hive runs. The tier is the entire distinction between the two, so the
name has to carry it, matching `deploy.swarm-controller` and
`deploy.swarm-ui`.
15 swarm-tier references renamed across 8 files. The hive-tier
collector's 16 references are deliberately untouched, verified as a
control on the same command.
Three spellings needed three different patterns, all inside this one
rename: the dotted path; the `mkRenamedOptionModule` target written as a
nix LIST (`[ ... "deploy" "otel" "enable" ]`), which no dotted grep can
match; and prose in docs/observability.md spelled `deploy.otel` with
neither `.enable` nor a leading dot. Unanchored `deploy\.otel\b` is the
only pattern that finds all three.
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