Shadow-DOM custom element (attachShadowCss, own <style>, matches the
<hive-dialog>/<hive-toast> pattern) that renders any hive_jobq graph
from the wire shape hive-jobq-wire serves: a tree from parent/child
structure, a state glyph per node, payload.label verbatim, and
payload.data as a generic key/value list. Never branches on what a
label or data key means, per the wire type's own opaque-payload
contract.
Fetch endpoint is a configurable attribute
(<hive-jobq-graph endpoint="/api/jobq/graph">) rather than
hardcoded, and a public render(nodes) method lets a host push
pre-fetched data (e.g. from its own SSE stream) instead. No transport
of its own beyond the initial self-fetch — refresh() is public so the
host decides its own refresh cadence.
Verified against real production data (61-node live rebuild-queue
graph, fetched from this hive's own /api/jobq/graph) via a jsdom
render: correct tree shape, correct state glyphs, correct data-list
presence count, both the self-fetching and render()-pushed paths,
and the empty-graph path.
Not wired into any page yet — the builds.js migration (hyperhive#2812)
follows once the open payload-gap question there is settled.
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