ci(r2-12): delete no-op nightly E2E workflow + redundant integration matrix (07/S-3, 07/P-5)

- v2-e2e.yml deleted: its `--filter Category=E2E` matches zero tests repo-wide (the
  E2ETests project doesn't exist) so it reported a permanent false green; and its
  docker-dev fleet binds the LAN-only shared GLAuth (10.100.0.35:3893) + builds local
  images, so it isn't hosted-runner-bootable anyway. FOLLOW-UP: when a runner-reachable
  fleet + a real tests/Server/...E2ETests land, add a fresh workflow WITH a zero-match
  guard (fail if Category=E2E matches nothing).
- v2-ci.yml integration matrix removed: fully redundant with the unit-tests leg, which
  already runs both Host.IntegrationTests + OpcUaServer.IntegrationTests under the
  identical filter, fixtureless, gated at MIN_EXECUTED=1. No coverage lost. The S-2
  option-#2 fixture-backed-leg follow-up is preserved as a NOTE comment in the workflow.
Header comments updated; YAML validates; jobs are now build -> unit-tests.

.github/workflows/v2-ci.yml

@@ -1,11 +1,11 @@
 # CI for the v2 branch — runs on every push + PR to the v2-akka-fuse / master
-# branches. Layered into three jobs:
+# branches. Layered into two jobs:
 #   build           dotnet restore + build (fast feedback on compile errors)
 #   unit-tests      the WHOLE solution minus the env-gated tiers (self-maintaining)
-#   integration     2-node Host.IntegrationTests harness + OpcUaServer.IntegrationTests
 #
-# Skips E2E (Category=E2E) — that runs nightly via v2-e2e.yml against the full
-# four-node docker-dev stack — and LiveIntegration (needs a real gateway/PLC/VPN).
+# Skips E2E (Category=E2E) and LiveIntegration (needs a real gateway/PLC/VPN) — both
+# are env-gated tiers with no hosted-runner fixtures. (The skip-gated *.IntegrationTests
+# still run in the unit-tests leg and Assert.Skip when their fixtures are unreachable.)
 #
 # Compatible with both GitHub Actions and Gitea Actions (act_runner). The .NET 10
 # SDK is pinned via global.json at the repo root; if no global.json exists, the
@@ -74,33 +74,13 @@ jobs:
           path: artifacts/trx/*.trx
           if-no-files-found: warn
 
-  integration:
-    needs: build
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        project:
-          - tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests
-          - tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.IntegrationTests
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: 10.0.x
-      - name: dotnet test ${{ matrix.project }}
-        run: >
-          dotnet test ${{ matrix.project }} --configuration Release
-          --filter "Category!=E2E&Category!=LiveIntegration"
-          --logger "trx" --results-directory artifacts/trx
-      # 07/S-2: this leg has NO fixtures on a hosted runner, so its tests legitimately Assert.Skip.
-      # Report-only (MIN_EXECUTED=0 never fails) so the skip tally is VISIBLE in the log instead of
-      # a silent green. FOLLOW-UP (S-2 option #2): start the one public-image fixture as a workflow
-      # `services:` block (mcr.microsoft.com/iotedge/opc-plc; the modbus/S7/AB/FOCAS sims are
-      # locally-built `otopcua-*` images not pullable here) + set OPCUA_SIM_ENDPOINT, then flip this
-      # leg to MIN_EXECUTED=1 so a fixture outage turns the job red.
-      - name: report skips (integration has no hosted fixtures yet)
-        if: always()
-        env:
-          MIN_EXECUTED: "0"
-        run: bash scripts/ci/assert-not-all-skipped.sh artifacts/trx/*.trx
+  # NOTE (07/P-5): the former `integration` matrix job (Host.IntegrationTests +
+  # OpcUaServer.IntegrationTests) was removed as fully redundant — the unit-tests leg
+  # above already runs BOTH projects under the identical filter, fixtureless, and gates
+  # them at MIN_EXECUTED=1. Its only unique output was a report-only skip tally the unit
+  # leg's trx already contains. FOLLOW-UP (S-2 option #2): if a fixture-backed integration
+  # leg is wanted, add it as a NEW job that starts the one public-image fixture as a
+  # `services:` block (mcr.microsoft.com/iotedge/opc-plc; the modbus/S7/AB/FOCAS sims are
+  # locally-built `otopcua-*` images not pullable here), sets OPCUA_SIM_ENDPOINT, and gates
+  # at MIN_EXECUTED=1 so a fixture outage turns the job red — covering something the unit
+  # leg cannot, rather than re-running the same fixtureless tests.