docs(#36): rig live gate PASS (two runs, reset echo held 751 ms on run 2); seed retargeted to String nodes; register row 120 — OPC UA scalar writes go out as String variants

Claude-Session: https://claude.ai/code/session_01XPsuy2ZZ5Gbyfpt8PrK5BV

docs/plans/2026-07-08-deferred-work-register.md

@@ -113,6 +113,7 @@ All 7 fix-now items landed via PLAN-04/05/06/07/08 (verified in review 08 round
 | 118 | **Pre-existing bUnit flake: `CentralUI.Tests.Pages.NotificationReportDetailModalTests.CloseButton_DismissesModal` (~10 %)** *(Low)*. Fails intermittently with `UnknownEventHandlerIdException` — the test resolves the close button once and clicks it after a re-render has already retired that element's handler id. Not caused by the step-logs work: the file is untouched since `40944a0d`. The fix is a one-liner — re-`Find` the button immediately before the click (the pattern the other modal tests already use) rather than reusing an element captured earlier in the test. | Observed during the step-logs full-suite runs, 2026-09-09 | It is a test-only race with a known cause and a known fix; it was out of scope for a remediation pass whose rule was to touch only the files under review. | Next time `CentralUI.Tests` is worked on, or the first time the flake blocks a gate run. |
 | 68 | ~~**`deploy.sh` run from a git worktree silently rehomes every node's bind-mount data dir**~~ **RESOLVED 2026-08-15 (guard added in the same close-out).** The compose files' bind mounts are relative (`./site-a-node-a/data`), so a deploy from a worktree checkout mounts the worktree's copies — the rig keeps running and looks healthy, but its SQLite stores split from the main checkout's and everything written there is orphaned by the next deploy from main. Bit the rows-46–53 close-out live: the seeding agent's `rig-probe-1` deploy persisted into worktree-homed dirs and "vanished" after the orchestrator's redeploy (no tombstone, no product bug — LWW/tombstone forensics ruled out deletion; the row sat in `.claude/worktrees/…/docker/site-a-node-a/data/site-localdb.db` the whole time). Both `docker/deploy.sh` and `docker-env2/deploy.sh` now refuse to run from a `.claude/worktrees/` path (override: `SCADABRIDGE_ALLOW_WORKTREE_DEPLOY=1`). | Found during the rows-46–53 close-out | Closed 2026-08-15. | — |
 | 119 | **Port the QA/prod MES receiver scripts onto the reset-aware `WriteBatchAndWaitAsync` overload (Gitea #36)** *(Medium)*. Template scripts CvdReactor MesMoveIn (13) / MesMoveOut (14) / MesSampleData (36) and base MESReceiver MoveIn/MoveOut (15, 16, 25, 26, 37, 38) still reset `<X>CompleteFlag` with a plain write and rely on `Task.Delay(1000)`; QA carries a config-only `WaitAsync(false, 10 s)` patch on 13/14 (deployment record 110). Rewrite: `var hs = await rx.Attributes.WriteBatchAndWaitAsync(values, "<X>Flag", true, "<X>CompleteFlag", true, 25 s, "<X>CompleteFlag", false, 10 s); if (!hs.Matched) return new { WasSuccessful=false, ErrorText = hs.ResetFailed ? "Timeout waiting for <X>CompleteFlag to reset" : "Timeout waiting for <X> to complete", BatchID=0 };` and delete the delay. Requires the #36 build on the target central + sites first (the overload does not exist on older sites → deploy-gate compile failure, by design). | Gitea #36, design `2026-09-10-handshake-reset-echo-design.md` §8 | Repo-only scope was the user's decision for the #36 session; the script bodies live only in the QA/prod databases. | Next QA deployment of a build ≥ this change (write a deployment record; then prod). |
+| 120 | **Data-sourced SCALAR writes reach the OPC UA server as String Variants — every non-String node rejects them with BadTypeMismatch (0x80740000)** *(Medium)*. `InstanceActor.HandleSetDataAttribute` / `HandleWriteAttributeBatch` decode only List values before the DCL write ("Scalars are unchanged"), so the codec-encoded string (`"True"`, `"42.5"`) reaches `RealOpcUaClient.WriteValuesAsync`, which wraps it in `new Variant(value)` — a String variant sent to a Boolean/Double node. Found live 2026-09-10 running `docker/seed-handshake-demo.sh` against opc-plc `Motor.Running`/`Pump.Running`/`Motor.Speed` (`SetAttribute('Complete') failed: OPC UA write failed with status: 0x80740000`); the seed was retargeted onto the rig's only two writable String nodes. The MxGateway path is unaffected in practice: prod's Delmia/MES handshakes write the same strings through the gateway today. Fix candidates: (a) decode scalars by declared `DataType` in the InstanceActor before the DCL write — also changes what MxGateway receives, so it needs a gateway-side compatibility check; (b) adapter-local: `RealOpcUaClient` coerces to the node's DataType (it already resolves `DataTypeIds` in `EnrichVariableTypeInfoAsync`), leaving the MxGateway wire untouched — preferred. Pin with a `RealOpcUaClientArrayWriteTests`-style test for a Boolean scalar. | Found live 2026-09-10 during the #36 rig gate | Out of scope for #36 (handshake ordering); touches the production write path and needs the MxGateway compatibility question answered first. | Before any OPC UA-bound template relies on script writes to non-String nodes (none does today — until this gate the rig's script writes to OPC UA were static-only). |
 
 ## Resolved (verified against the code 2026-07-10)
 Rows removed from the Deferred table above once confirmed shipped. Kept here for traceability.