Update CI workflow and README for submodule support

- Update CI workflow to checkout submodules recursively
- Update README with submodule cloning instructions
- Add project structure notes about submodules
- Create comprehensive review summary document

.github/workflows/ci.yml

@@ -14,6 +14,8 @@ jobs:
         working-directory: ./contracts
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
       
       - name: Install Foundry
         uses: foundry-rs/foundry-toolchain@v1
@@ -49,6 +51,8 @@ jobs:
           --health-retries 5
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
       
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -83,6 +87,8 @@ jobs:
         working-directory: ./frontend
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
       
       - name: Setup Node.js
         uses: actions/setup-node@v4
@@ -107,6 +113,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: recursive
       
       - name: Run security audit
         run: |