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/ci.yml

@@ -0,0 +1,73 @@
+name: CI
+
+on:
+  push:
+    branches: ["**"]
+  pull_request:
+    branches: ["**"]
+
+jobs:
+  python:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+          cache: 'pip'
+
+      - name: Install Poetry
+        run: python -m pip install --upgrade pip poetry
+
+      - name: Install dependencies
+        run: |
+          poetry config virtualenvs.create false
+          poetry install --no-interaction --no-ansi
+
+      - name: Lint (ruff)
+        run: poetry run ruff check .
+
+      - name: Check .env.example drift
+        run: python scripts/focused_dotenv_linter.py --check
+
+      - name: Test (pytest)
+        run: poetry run pytest --cov=aitbc_cli --cov-report=term-missing --cov-report=xml
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          file: ./coverage.xml
+          flags: unittests
+          name: codecov-umbrella
+
+  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: Compile
+        run: npm run compile
+
+      - name: Test
+        run: npm test