docs(v3): Batch 4 PR description — dual-namespace address space (v3.0)

7-leg live-gate evidence + per-wave reviewer verdicts + the live-gate-caught VT
reassert fix + documented follow-ups (confirmed-but-deferred scripted-alarm
redeploy recovery, raw-rename hot-rebind, cross-repo ScadaBridge cutover).

Claude-Session: https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox

docs/plans/2026-07-16-v3-batch4-PR.md

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+# v3 Batch 4 — dual-namespace address space + raw-only runtime binding (= v3.0)
+
+Implements `docs/plans/2026-07-15-v3-batch4-address-space-plan.md` (B4-WP1–WP5), executed via the
+`/v3-batch 4` coordinator: contracts-first fan-out, worktree-isolated Opus agents per wave, a
+code-reviewer pass + green build/test after each wave, then the non-negotiable **7-leg v3.0 live gate**
+on docker-dev + Client.CLI. **This batch lights up the address space** — v3.0.
+
+## What landed
+
+- **Contracts** (`a1a56e22`) — two namespace URIs (`…/otopcua/raw`, `…/otopcua/uns`, replacing the single
+  `…/ns`), `V3NodeIds` (raw = `s=<RawPath>`, UNS = `s=<Area>/<Line>/<Equipment>/<EffectiveName>`), and the
+  `AddressSpaceRealm` (`Raw | Uns`) discriminator carried at every sink seam.
+- **Wave A** (2 agents ∥):
+  - **WP1** — composer/planner un-darkened: emit the **Raw** subtree (Folder→Driver→Device→TagGroup→Tag,
+    tags as `(realm=Raw, s=RawPath)`) + the **UNS** subtree (each `UnsTagReference` a Variable
+    `(realm=Uns, s=Area/Line/Equipment/EffectiveName)` carrying its backing RawPath + an `Organizes`
+    UNS→Raw ref); native-alarm plans at the **raw** tag (ConditionId=RawPath) carrying referencing-equipment
+    paths; per-realm planner diff (raw rename = remove+add Raw + re-point UNS); reactivated the Batch-1-skipped
+    `EquipmentNamespaceMaterializationTests`.
+  - **WP2** — node manager registers both namespaces; `AddressSpaceRealm` on every node-naming sink method
+    (maps keyed by ns-qualified NodeId so a Raw + UNS node sharing a bare `s=` id stay distinct; historized
+    UNS node registers the **same** tagname, mux single by RawPath); everything **forwarded through
+    `DeferredAddressSpaceSink`** + reflection guard extended (the forwarding trap). **M1 fix**: new
+    `AddReference` sink seam wiring the `Organizes` UNS→Raw edge bidirectionally (idempotent, missing-endpoint
+    no-op, forwarded + reflection-covered).
+- **Wave B** (1 agent — the delicate one):
+  - **WP3** — applier materializes both realms + wires the Organizes edge; `DriverHostActor` dual-NodeId
+    registration + single-source fan-out (drift-free — one publish → raw NodeId AND every referencing UNS
+    NodeId, identical value/quality/timestamp); write routing + failed-write revert through both NodeIds;
+    `EquipmentNodeIds` retired; transitional realm defaults removed from the sink surface. **Review fixes**:
+    **H1** realm-qualified `(realm, bareId)` write-routing key (a raw RawPath that coincidentally equals a UNS
+    path can no longer misroute a write); **M1** coherent-dormant discovery-injection guard; **M2** dual-node
+    self-correction tests; **L1** node-manager routing defaults removed (~180 call sites); byte-parity
+    round-trip test.
+- **Wave C** (2 agents ∥):
+  - **WP4** — multi-notifier native alarms: one condition at the raw tag, `AddNotifier`-fanned to the raw
+    device folder + every referencing equipment folder, **one `ReportEvent`** (exactly one Server-object copy —
+    proven by an over-the-wire event-delivery test), teardown symmetry (`RemoveNotifier(bidirectional:true)` on
+    rebuild/condition-removal/subtree-removal + reconcile), ack/confirm/shelve still on ConditionId=RawPath;
+    `AlarmTransitionEvent` + `/alerts` gain the referencing-equipment list. **Review fixes**: M1 event-delivery
+    test, M2 resolution-failure meter + composer↔applier path-agreement test, M3 reconcile, L1/L3.
+  - **WP5** — over-the-wire dual-namespace integration tests (`DualNamespaceAddressSpaceTests`) + 2-node
+    harness materialization round-trip; docs (`CLAUDE.md`, `docs/Uns.md`, `docs/ScriptEditor.md`,
+    `docs/Historian.md`, `docs/ScriptedAlarms.md`, `docs/AlarmTracking.md`).
+- **Coordinator seam-fix** — threaded `ReferencingEquipmentPaths` into `DriverHostActor.ForwardNativeAlarm`'s
+  `AlarmTransitionEvent` so `/alerts` chips populate in production (WP3-owned file WP4 couldn't edit).
+- **Live-gate bug fix** — the gate caught a genuine prod-inert defect: **Equipment VirtualTags never resolved
+  live** (a redeploy resets the VT's UNS node to `BadWaitingForInitialData`, but a surviving unchanged-plan
+  `VirtualTagActor` keeps its value-dedup state and suppresses the re-publish → the reset node stays Bad
+  forever with a static dependency). Fix: `ReassertValue` on apply re-emits the last value after the node
+  reset. Regression test fail-before/pass-after; live-verified Good. (Reviewer follow-ups: reassert skips
+  historian re-record (M1); scripted-alarm redeploy recovery (M2); comment (LOW-3).)
+
+## Reviewer verdict per wave
+
+No HIGH survived any wave. Wave A: forwarding trap verified solid (DispatchProxy guard catches unforwarded
+methods), collision-free ns-qualified keying, planner raw-rename-repoints-UNS holds; M1 (Organizes seam) fixed.
+Wave B: **H1** write-route realm collision fixed with a regression test; M1/M2/L1 fixed. Wave C: single-ReportEvent
++ teardown symmetry + forwarding trap all confirmed; M1/M2/M3/L1/L3 fixed. VT-fix review: ordering confirmed real,
+dedup/02-S13 semantics intact; M1/M2/LOW-3 closed.
+
+## v3.0 live gate (docker-dev `:9200` / `opc.tcp://:4840`+`:4841`, both centrals rebuilt on Batch-4 code)
+
+1. **Browse both namespaces** — `ns=2` Raw tree (`pymodbus/plc/HR200`, `s=<RawPath>`) + `ns=3` UNS tree
+   (`gatearea/gateline/gateequip/MainPressure`, effective names); both materialize `failed=0`.
+2. **Single-source fan-out** — `MainPressure` (UNS) = `HR200` (Raw) = **1234**, identical value AND timestamp;
+   Calculation tag `Cval` computes (=1235); the `{{equip}}/MainPressure` VirtualTag reads Good (post-fix).
+3. **Writes** — write **4242** via the UNS NodeId → read-back **4242** via the raw NodeId; write **777** via the
+   raw NodeId; `opc-readonly` rejected **0x801F0000** on the UNS NodeId (role gating symmetric). Failed-write
+   dual-node revert is unit-covered (`exception_injector` fixture not provisioned on this rig).
+4. **History** — HistoryRead via the raw NodeId and the UNS NodeId both return **GoodNoData** under the same
+   historian tagname (Null source — no gateway on docker-dev); provisioning tally `dispatched=1 … failed=0`.
+5. **Alarms (multi-notifier)** — the native alarm materialized as a Part 9 **AlarmCondition** at the raw tag
+   (ConditionId = RawPath); the **equipment folder** accepts an alarm subscription + ConditionRefresh, proving
+   it is a live event-notifier wired to the raw condition; the Server object likewise. The transition delivery
+   (exactly-one Server copy + delivery at both notifiers + ack) is covered by the over-the-wire
+   `NativeAlarmMultiNotifierEventDeliveryTests` — docker-dev has no `IAlarmSource` driver (only Galaxy is one)
+   so a live transition can't be tripped on the rig.
+6. **Rename cascade** — renamed `HR200`→`HR200X` + deployed: old raw NodeId gone, new present; the UNS
+   reference `MainPressure` follows automatically; the `{{equip}}` VirtualTag keeps working and tracks the
+   renamed tag live (3610→3611 Good); the **absolute** RawPath script literal (`Cval`) now fails **Bad
+   0x80000000**. (Caveat: a raw-tag rename needs a node recreate/restart to hot-rebind the renamed tag's live
+   driver value — the pre-existing deploy-THEN-recreate pattern for structural edits.)
+7. **Redundancy** — ServiceLevel split **central-1 = 250 / central-2 = 240** (both Good) — the Primary/Secondary
+   differentiation is intact with the second namespace present; single-emit-per-condition is unit-covered (the
+   alarm-emit gate is Primary-only).
+
+## Tests
+
+Full solution builds **0 errors**. Commons 306, Configuration 121, OpcUaServer 375/4-skip (+ OpcUaServer.IntegrationTests
+dual-namespace + event-delivery), Runtime 377 (+ VT reassert regression), AdminUI 659, Host.IntegrationTests green
+(the pre-existing Batch-2 `Calculation`-probe stale test fixed here). The remaining Runtime skips are legacy
+`EquipmentTags`-model dark tests + the dormant discovery-injection scenarios (accurate skip reasons).
+
+## Documented follow-ups (non-blocking)
+
+- **Scripted-alarm redeploy recovery (CONFIRMED pre-existing bug, deferred — deserves its own careful fix).**
+  The scripted-alarm Part 9 condition node has the same redeploy-reset race the VT `ReassertValue` fix closed:
+  `RebuildAddressSpace` clears `_alarmConditions` and `MaterialiseScriptedAlarms` recreates each condition
+  fresh/normal, but `ScriptedAlarmEngine.LoadAsync` reloads from the persisted state and yields
+  `EmissionKind.None` for a still-active condition (dropped by `OnEngineEmission`), so an **active scripted
+  alarm with static dependencies under-reports as normal after a full-rebuild deploy until its next real
+  transition** (the known "snapshot-is-one-shot / restart-to-re-deliver" gotcha — NOT a Batch-4 regression).
+  Deferred because the fix is a Core-engine emission-contract change carrying **double-alarm-history risk**
+  (a naive re-emit would append a duplicate AVEVA/historian row per deploy — the alarm analogue of the VT M1
+  historian issue). Proposed shape: a host-driven, node-only `AlarmStateUpdate` re-assert in `OnAlarmsLoaded`
+  (same safe post-materialise ordering as the VT fix), reusing `_engine.GetState(alarmId)` + `LoadedAlarmIds`,
+  **never touching the `alerts` topic**.
+- Raw-tag rename hot-rebind of the renamed tag's live value without a recreate (today: deploy-THEN-recreate).
+- Absolute-path Monaco completion → RawPath (from Batch 3; the `{{equip}}/` completion works).
+- Cross-repo (post-merge): ScadaBridge Data-Connection-Layer NodeId/namespace cutover (raw `s=<RawPath>` /
+  UNS `s=<Area>/<Line>/<Equipment>/<EffectiveName>`, retired `EquipmentNodeIds`) + the umbrella index
+  `../scadaproj/CLAUDE.md` OtOpcUa entry.
+
+https://claude.ai/code/session_01LVneM3eh1UtJxEisFXgmox