Update submodule references and improve CI workflow

- Update submodule references for explorer-monorepo and smom-dbis-138 to latest commits.
- Modify CI workflow to include shellcheck installation and enforce error severity for script checks.
- Update contract addresses in configuration and documentation to reflect the new canonical addresses for CCIPWETH9Bridge and CCIP Router.
- Revise integration test documentation to align with updated contract addresses and deployment statuses.

Made-with: Cursor

.github/workflows/validate-omnl-rail.yml

@@ -13,6 +13,7 @@ on:
     paths:
       - 'scripts/omnl/**'
       - 'docs/04-configuration/mifos-omnl-central-bank/**'
+      - '.gitignore'
       - '.github/workflows/validate-omnl-rail.yml'
 
 jobs:
@@ -29,10 +30,8 @@ jobs:
       - name: Transaction package CI smoke (fast ledger fixture)
         run: bash scripts/omnl/run-transaction-package-ci-smoke.sh
 
-      - name: Shellcheck (optional)
-        run: |
-          if command -v shellcheck >/dev/null 2>&1; then
-            shellcheck -x scripts/omnl/*.sh || true
-          else
-            echo "Shellcheck not installed; skipping."
-          fi
+      - name: Install shellcheck
+        run: sudo apt-get update -qq && sudo apt-get install -y shellcheck
+
+      - name: Shellcheck scripts/omnl (severity error)
+        run: shellcheck -S error -x scripts/omnl/*.sh