Enhance repo organization and structure

.dockerignore

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+# Git
+.git
+.gitignore
+.github
+
+# Python
+__pycache__
+*.py[cod]
+*$py.class
+*.so
+.Python
+*.egg-info
+dist
+build
+*.egg
+
+# Virtual environments
+venv/
+env/
+ENV/
+.venv
+
+# IDE
+.vscode
+.idea
+*.swp
+*.swo
+*~
+
+# Testing
+.pytest_cache
+.coverage
+htmlcov
+.tox
+.nox
+
+# Documentation
+docs/_build
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Project specific
+*.blockchain
+wallets/
+*.key
+*.pem
+logs/
+data/
+*.log
+
+# Development
+*.md
+LICENSE
+.dockerignore
+docker-compose.yml

.github/workflows/ci.yml

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+name: Blockchain CI/CD
+
+on:
+  push:
+    branches: [ main, develop, claude/** ]
+  pull_request:
+    branches: [ main, develop ]
+
+jobs:
+  test:
+    name: Test on Python ${{ matrix.python-version }}
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11']
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Cache pip packages
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install -e .
+
+    - name: Run tests with pytest
+      run: |
+        pytest -v --cov=blockchain_core --cov-report=xml --cov-report=term
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v3
+      with:
+        file: ./coverage.xml
+        flags: unittests
+        name: codecov-umbrella
+        fail_ci_if_error: false
+
+  lint:
+    name: Lint and Format Check
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install flake8 black pylint mypy
+
+    - name: Lint with flake8
+      run: |
+        # Stop the build if there are Python syntax errors or undefined names
+        flake8 blockchain_core --count --select=E9,F63,F7,F82 --show-source --statistics
+        # Exit-zero treats all errors as warnings
+        flake8 blockchain_core --count --exit-zero --max-complexity=10 --max-line-length=120 --statistics
+
+    - name: Check formatting with black
+      run: |
+        black --check blockchain_core tests examples
+
+    - name: Lint with pylint
+      run: |
+        pylint blockchain_core --exit-zero
+
+    - name: Type check with mypy
+      run: |
+        mypy blockchain_core --ignore-missing-imports --no-strict-optional || true
+
+  security:
+    name: Security Check
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install safety bandit
+
+    - name: Check for security vulnerabilities
+      run: |
+        safety check --json || true
+
+    - name: Run bandit security linter
+      run: |
+        bandit -r blockchain_core -f json -o bandit-report.json || true
+
+    - name: Upload bandit report
+      uses: actions/upload-artifact@v3
+      with:
+        name: bandit-security-report
+        path: bandit-report.json
+
+  docker:
+    name: Build Docker Image
+    runs-on: ubuntu-latest
+    needs: [test, lint]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Build Docker image
+      run: |
+        docker build -t blockchain:${{ github.sha }} .
+
+    - name: Test Docker image
+      run: |
+        docker run --rm blockchain:${{ github.sha }} python -c "from blockchain_core import Blockchain; print('Docker build successful!')"
+
+  examples:
+    name: Run Examples
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.11'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install -e .
+
+    - name: Run basic usage example
+      run: |
+        python examples/basic_usage.py
+
+    - name: Run advanced features example
+      run: |
+        python examples/advanced_features.py

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# PEP 582
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Blockchain specific
+*.blockchain
+wallets/
+*.key
+*.pem
+
+# Logs
+logs/
+*.log