refactor(opcuaserver): rename Phase7* address-space pipeline to AddressSpace*

The OPC UA address-space build pipeline was named after a v2-roadmap
milestone number rather than its domain. Rename the family to describe
what it does (build/diff/apply the OPC UA address space):

  Phase7Composer          -> AddressSpaceComposer
  Phase7CompositionResult -> AddressSpaceComposition
  Phase7Planner           -> AddressSpacePlanner
  Phase7Plan              -> AddressSpacePlan
  Phase7Applier           -> AddressSpaceApplier
  Phase7ApplyOutcome      -> AddressSpaceApplyOutcome

The 9 Phase7*Tests suites follow suit; Phase7ScriptingEntitiesTests ->
ScriptingEntitiesTests (it tests the scripting migration, not the
pipeline). Log-message prefixes move to the new class names.

Pure mechanical rename, no behavioral change. EF migration classes/IDs
(AddPhase7ScriptingTables, ExtendComputeGenerationDiffWithPhase7) are
immutable and left untouched, as are historical design docs.

Build clean; OpcUaServer 261/261, Runtime 272/272, ScriptingEntities
12/12 green.

tests/Server/ZB.MOM.WW.OtOpcUa.Runtime.Tests/Drivers/DeploymentArtifactArrayParityTests.cs

@@ -12,7 +12,7 @@ namespace ZB.MOM.WW.OtOpcUa.Runtime.Tests.Drivers;
 /// <summary>
 ///     Proves the Phase 4c array intent (<c>isArray</c> + optional <c>arrayLength</c>), which rides
 ///     inside the raw <c>TagConfig</c> JSON blob, round-trips with byte-parity through both
-///     equipment-tag producers: the live-edit composer (<see cref="Phase7Composer.Compose"/>) and the
+///     equipment-tag producers: the live-edit composer (<see cref="AddressSpaceComposer.Compose"/>) and the
 ///     artifact decoder (<see cref="DeploymentArtifact.ParseComposition(System.ReadOnlySpan{byte})"/>).
 ///     A secondary/follower node decoding a serialized deployment artifact MUST materialise array tags
 ///     identically to the primary, so the artifact side must derive <c>IsArray</c> / <c>ArrayLength</c>
@@ -153,7 +153,7 @@ public sealed class DeploymentArtifactArrayParityTests
         var namespaces = new[] { ns };
 
         // ---- Side 1: the live-edit composer ----
-        var composed = Phase7Composer.Compose(
+        var composed = AddressSpaceComposer.Compose(
             areas, lines, equipment, drivers, Array.Empty<ScriptedAlarm>(), tags, namespaces);
 
         // ---- Side 2: serialise the SAME draft to the artifact blob shape, then decode it ----