chore(security): enhance environment configuration, CI workflows, and wallet daemon with security improvements

- Restructure .env.example with security-focused documentation, service-specific environment file references, and AWS Secrets Manager integration
- Update CLI tests workflow to single Python 3.13 version, add pytest-mock dependency, and consolidate test execution with coverage
- Add comprehensive security validation to package publishing workflow with manual approval gates, secret scanning, and release

.github/workflows/contracts-ci.yml

@@ -0,0 +1,41 @@
+name: Contracts CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  contracts:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: contracts
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: contracts/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Slither Analysis
+        run: npm run slither
+        # Note: Slither runs locally without any cloud services or API keys
+
+      - name: Compile
+        run: npm run compile
+
+      - name: Test
+        run: npm test