feat: implement Part 1 core foundation and architecture(#4)

.env.example

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+# ─────────────────────────────────────────────────────────────────────────────
+# TAP Voice Agent — Environment Variables Reference
+# Copy this file to .env and fill in real values.
+# NEVER commit your .env file — it is git-ignored.
+# ─────────────────────────────────────────────────────────────────────────────
+
+# ── App identity ──────────────────────────────────────────────────────────────
+APP_NAME=tap-voice-agent
+VERSION=0.1.0
+ENVIRONMENT=development         # development | staging | production
+DEBUG=false
+
+# ── Server ────────────────────────────────────────────────────────────────────
+HOST=0.0.0.0
+PORT=8000
+WORKERS=1
+
+# ── Logging ───────────────────────────────────────────────────────────────────
+LOG_LEVEL=INFO                  # DEBUG | INFO | WARNING | ERROR
+LOG_FORMAT=console              # console (dev) | json (prod)
+
+# ── CORS (comma-separated list of allowed origins) ────────────────────────────
+CORS_ORIGINS=*
+
+# ── VAPI (voice platform) — leave blank to use mock ──────────────────────────
+VAPI_API_KEY=
+VAPI_BASE_URL=https://api.vapi.ai
+VAPI_PHONE_NUMBER_ID=
+
+# ── Twilio (fallback calling) — leave blank to use mock ──────────────────────
+TWILIO_ACCOUNT_SID=
+TWILIO_AUTH_TOKEN=
+TWILIO_FROM_NUMBER=
+
+# ── WhatsApp / Meta ───────────────────────────────────────────────────────────
+META_WHATSAPP_TOKEN=
+META_PHONE_NUMBER_ID=
+META_VERIFY_TOKEN=tap_verify_token
+
+# ── TAP LMS (Frappe REST) ─────────────────────────────────────────────────────
+TAP_LMS_BASE_URL=https://lms.theapprenticeproject.org
+TAP_LMS_API_KEY=
+TAP_LMS_API_SECRET=
+TAP_LMS_USE_MOCK=true           # Set to false when real credentials are available
+
+# ── Language detection ────────────────────────────────────────────────────────
+DEFAULT_LANGUAGE=en
+SUPPORTED_LANGUAGES=hi,mr,pa,en
+
+# ── Nudge engine ──────────────────────────────────────────────────────────────
+NUDGE_INACTIVITY_DAYS=3         # Days of LMS inactivity before nudge fires
+NUDGE_MAX_PER_WEEK=2            # Max calls per learner per week
+
+# ── Metrics ───────────────────────────────────────────────────────────────────
+ENABLE_METRICS=true
+METRICS_EXPORT_INTERVAL=60
+
+# ── Database (SQLite default, swap to Postgres in production) ─────────────────
+DATABASE_URL=sqlite+aiosqlite:///./tap_agent.db
+# DATABASE_URL=postgresql+asyncpg://user:password@localhost:5432/tap_agent

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.11"]
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: 'pip'
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install -r requirements-dev.txt
+
+    - name: Lint with ruff
+      run: |
+        ruff check .
+
+    - name: Type check with mypy
+      run: |
+        mypy app
+
+    - name: Test with pytest
+      run: |
+        pytest --cov=app --cov-report=xml
+
+    - name: Upload coverage reports to Codecov
+      uses: codecov/codecov-action@v4
+      env:
+        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

.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/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.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
+*.pyverse
+.hypothesis/
+.pytest_cache/
+cover/
+
+# 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
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__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/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+.idea/
+
+# VS Code
+.vscode/
+
+# MacOS
+.DS_Store
+
+# Application specific
+tap_agent.db
+*.db

Dockerfile

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+# ── Stage 1: dependency builder ───────────────────────────────────────────────
+FROM python:3.11-slim AS builder
+
+WORKDIR /build
+
+# Install pip tools
+RUN pip install --upgrade pip
+
+# Copy dependency manifests first for layer caching
+COPY requirements.txt requirements-dev.txt ./
+
+# Install production deps into /build/venv
+RUN python -m venv /build/venv \
+    && /build/venv/bin/pip install --no-cache-dir -r requirements.txt
+
+
+# ── Stage 2: production image ──────────────────────────────────────────────────
+FROM python:3.11-slim AS runtime
+
+LABEL org.opencontainers.image.title="TAP Voice Agent" \
+      org.opencontainers.image.description="Multilingual Voice Agent — C4GT 2026" \
+      org.opencontainers.image.source="https://github.com/SuryaPratapIIIT/C4GT_2026" \
+      org.opencontainers.image.licenses="MIT"
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PATH="/venv/bin:$PATH"
+
+# Non-root user for security
+RUN addgroup --system appgroup && adduser --system --ingroup appgroup appuser
+
+WORKDIR /app
+
+# Copy virtual environment from builder
+COPY --from=builder /build/venv /venv
+
+# Copy application source
+COPY app/ ./app/
+
+# Ownership
+RUN chown -R appuser:appgroup /app
+
+USER appuser
+
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://localhost:8000/health/live')"
+
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "2"]