The collector names components `<kind>/<owner>` — a hive name for the
per-hive pipelines, the literal `swarm` for the swarm tier's own. Both
land in one attrset via `//`, so a hive named `swarm` replaced the swarm
tier's parts and lost its own: its receiver kept accepting pushes into a
pipeline that routed nowhere, and its samples lost the `hive` stamp that
makes attribution unforgeable. Zero failed assertions.
The reserved name is now bound once and interpolated at each swarm-tier
use, so the guard checks the same string the config emits rather than a
copy of it. A second swarm-tier pipeline joins the list and inherits the
check without touching the assertion.
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