fix(alarms): atomic InactiveUnacknowledged + flagged Clear/Acknowledge first sight for OpcUaClient (#657)

After an OpcUaClient respawn an upstream inactive+unacked condition went out as
Retrigger+Clear (duplicate Activated+Cleared rows, Active flicker), and a
first-sight inactive+acked one as Unspecified (an Activated row for an inactive
alarm; a retained-Active host condition never cleared).

- New AlarmTransitionKind.InactiveUnacknowledged: one projection, rows only for
  what changed (Activated+Cleared from acked, Cleared from active+unacked, none
  when already inactive+unacked).
- OpcUaClient uses it for moves into inactive+unacked; first sight of an
  inactive condition is InactiveUnacknowledged or Clear+Acknowledge, flagged.
- Projector: a flagged Acknowledge on an already-acked condition writes no row.
- E2E tests through DriverHostActor.ForwardNativeAlarm (red-proven).

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

CLAUDE.md

@@ -1151,7 +1151,11 @@ host logger factory (wired in `DriverFactoryBootstrap`; the FOCAS and TwinCAT fa
   to duplicate them); a flagged `Unspecified` on an already-active condition (AbCip ALMA governing-limit drop-out)
   moves the node's text/severity, keeps active/acked and writes no row. Active+acked is the atomic **`AlarmTransitionKind.ActiveAcknowledged`** (Galaxy snapshot
   `ActiveAcked`, OpcUaClient inactive→acked-active) — never Acknowledge (kept a cold host's `Active=false`: the alarm was
-  invisible) nor Raise+Acknowledge (an unacked intermediate). `NativeAlarmProjector` returns the rows to write; unflagged
+  invisible) nor Raise+Acknowledge (an unacked intermediate). Its mirror **`InactiveUnacknowledged`** (#657, OpcUaClient)
+  replaces Raise/Retrigger+Clear (an Active flicker; rows only for what changed). OpcUaClient's first sight of an inactive
+  condition is a flagged InactiveUnacknowledged, or flagged Clear+Acknowledge for inactive+acked (a flagged Acknowledge on an
+  acked condition writes no row) — never `Unspecified`, which wrote "Activated" for an inactive alarm and left a
+  retained-Active condition Active. `NativeAlarmProjector` returns the rows to write; unflagged
   sources (FOCAS/MTConnect, live Galaxy) are unchanged. E2E: `Runtime.Tests/NativeAlarmRestatementEndToEndTests`.
 - **Re-Initialize without teardown (#630):** FOCAS, AbLegacy, AbCip, TwinCAT, S7 and OpcUaClient `InitializeAsync`
   first release the prior device/session state (cancel, ≤ 5 s join, dispose — incl. the AbCip alarm projection;