hermes.extension.install.count gains failure_class (closed per-kind set named at each failure exit
of the skills hub, plugin installer and MCP catalog emitters; raised exceptions classify by their
tagged class or TYPE, exception:<Type> collapses to exception, never the message) and registry
(the skills-hub adapter SOURCE_ID that resolved/served a skill; none/unresolved/other otherwise).
hermes.update.run gains failure_class derived from the FINAL receipt only (admission step,
stop_reason exception type, exit_code, stage marks, fleet states, gateway_restart). failed_stage no
longer reads 'other' for runs whose every mark passed: a 'partial' receipt (written only by the
post-restart verification) synthesizes a failed verify stage, and a failed run ending on a skipped
restart reads restart.
Package schema v4 is extended in place (canary-only): the pre-split field sets stay valid as the
second oneOf shape and in _LEGACY_METRIC_FIELDS so pending rows drain.
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