`build_tombstone_views` folded `transient_snapshot`'s keys into its `live`
set, so an agent with in-flight transient work was treated as not-a-tombstone.
Since #3010 that set is derived from the running job graph, which made a
page about on-disk state a function of the scheduler.
Dropping the filter exposes what was always true underneath: nothing records
a destroy. Every definition-side artifact — state subvolume, proposed +
applied repos, `deployed/0`, meta registration, topology entry — is written by
`Provision` before the container exists and survives `lifecycle::destroy`. So
a mid-spawn agent is byte-identical on disk to a tombstone.
Per mara on #3020: remove the filter, warn on the page, keep the issue open
for the swarm-controller / snapshot-storage rework where the problem shape
changes anyway.
- dashboard/tombstones.rs: drop the param + the chain; document the real
semantics
- core.js: amber caveat banner above the rows; row badge `destroyed` ->
`offline`, which is what an absent container actually proves
- dashboard.css: `.tombstone-warn`, modelled on `.port-conflict` but amber and
without the pulse — a permanent banner that pulses trains you to ignore it
- docs/web-ui/dashboard.md: the pane was described as "destroyed-but-state-kept
agents", now the exact wrong claim
6a8a729f58