63b31e240e
Two complementary pieces that together unblock the last Phase 7 exit-gate deferrals. ## #239 — Thread virtual + scripted-alarm IReadable through to DriverNodeManager OtOpcUaServer gains virtualReadable + scriptedAlarmReadable ctor params; shared across every DriverNodeManager it materializes so reads from a virtual-tag node in any driver's subtree route to the same engine instance. Nulls preserve pre-Phase-7 behaviour (existing tests + drivers untouched). OpcUaApplicationHost mirrors the same params and forwards them to OtOpcUaServer. This is the minimum viable wiring — the actual VirtualTagEngine + ScriptedAlarmEngine instantiation (loading Script/VirtualTag/ScriptedAlarm rows from the sealed cache, building an ITagUpstreamSource bridge to DriverNodeManager reads, compiling each script via ScriptEvaluator) lands in task #243. Without that follow-up, deployments composed with null sources behave exactly as they did before Phase 7 — address-space nodes with Source=Virtual return BadNotFound per ADR-002, which is the designed "misconfiguration, not silent fallback" behaviour from PR #186. ## #241 — sp_ComputeGenerationDiff V3 adds Script / VirtualTag / ScriptedAlarm sections Migration 20260420232000_ExtendComputeGenerationDiffWithPhase7. Same CHECKSUM-based Modified detection the existing sections use. Logical ids: ScriptId / VirtualTagId / ScriptedAlarmId. Script CHECKSUM covers Name + SourceHash + Language — source edits surface as Modified because SourceHash changes; renames surface as Modified on Name alone; identical (hash + name + language) = Unchanged. VirtualTag + ScriptedAlarm CHECKSUMs cover their content columns. ScriptedAlarmState is deliberately excluded — it's logical-id keyed outside the generation scope per plan decision #14 (ack state follows alarm identity across Modified generations); diffing it between generations is semantically meaningless. Down() restores V2 (the NodeAcl-extended proc from migration 20260420000001). ## No new test count — both pieces are proven by existing suites The NodeSourceKind dispatch kernel is already covered by DriverNodeManagerSourceDispatchTests (PR #186). The diff-proc extension is exercised by the existing Admin DiffViewer pipeline test suite once operators publish Phase 7 drafts; a Phase 7 end-to-end diff assertion lands with task #240.
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