chore: add microservice architecture scaffolding

Add Dockerfile, .dockerignore, .env.example, api/openapi.yaml,
deploy/docker/docker-compose.yml, docs/architecture.md, and
.github/workflows/docker.yml for GHCR build+push CI.

Author: Patel230

.dockerignore

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+.git
+.github
+.gitignore
+*.md
+.env
+.env.*
+Dockerfile
+.dockerignore
+docs/
+deploy/
+api/
+tests/
+__pycache__/
+*.pyc
+.venv/

.env.example

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+# hawk-sdk-python environment variables — copy to .env and fill in
+# The hawk daemon must be running locally before using this SDK.
+HAWK_BASE_URL=http://127.0.0.1:4590
+HAWK_API_KEY=

.github/workflows/docker.yml

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+name: Docker
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+    branches: [main]
+    paths:
+      - "Dockerfile"
+      - "src/**"
+      - "pyproject.toml"
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: graycodeai/hawk-sdk-python
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=sha-
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+FROM python:3.12-slim AS builder
+
+WORKDIR /build
+COPY pyproject.toml ./
+RUN pip install --no-cache-dir build
+
+COPY src/ src/
+RUN python -m build --wheel
+
+FROM python:3.12-slim
+RUN apt-get update && apt-get install -y --no-install-recommends ca-certificates tini && \
+    rm -rf /var/lib/apt/lists/* && \
+    adduser --disabled-password --gecos "" --uid 1000 hawk
+
+COPY --from=builder /build/dist/*.whl /tmp/
+RUN pip install --no-cache-dir /tmp/*.whl && rm -rf /tmp/*.whl
+
+USER hawk
+WORKDIR /workspace
+ENTRYPOINT ["tini", "--"]
+CMD ["sleep", "infinity"]

api/openapi.yaml

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+openapi: "3.1.0"
+info:
+  title: hawk-sdk-python — Python SDK API Reference
+  description: |
+    Python SDK for the hawk daemon HTTP API. Provides sync and async clients,
+    SSE streaming, tool decorator, and workflow builder.
+
+    This is a client SDK — it connects to the hawk daemon at http://localhost:4590.
+    See hawk's api/openapi.yaml for the server-side contract.
+  version: "0.1.0"
+  license:
+    name: MIT
+    url: https://github.com/GrayCodeAI/hawk-sdk-python/blob/main/LICENSE
+  contact:
+    url: https://github.com/GrayCodeAI/hawk-sdk-python
+
+servers:
+  - url: http://localhost:4590
+    description: Hawk daemon (managed by hawk, not this SDK)
+
+x-sdk-api:
+  package: hawk
+  classes:
+    - name: HawkClient
+      description: Synchronous client
+      constructor_args:
+        base_url: string
+        api_key: string
+      methods:
+        - health()
+        - chat(message, **kwargs)
+        - chat_stream(message, **kwargs)
+        - list_sessions(limit, offset)
+        - get_session(session_id)
+        - delete_session(session_id)
+        - get_session_messages(session_id, limit, offset)
+        - stats()
+    - name: AsyncHawkClient
+      description: Asynchronous client (same methods with async/await)
+    - name: Agent
+      description: Higher-level conversation agent with session history
+    - name: Workflow
+      description: Multi-step workflow builder with retry config
+  decorators:
+    - name: tool
+      description: Decorator to register a function as a hawk tool
+      usage: "@tool()"

deploy/docker/docker-compose.yml

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+name: hawk-sdk-python
+
+services:
+  hawk-sdk-python:
+    build:
+      context: ../../
+      dockerfile: Dockerfile
+    image: ghcr.io/graycodeai/hawk-sdk-python:dev
+    env_file:
+      - path: ../../.env.example
+        required: false

docs/architecture.md

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+<div align="center">
+
+# 🐍 hawk-sdk-python Architecture
+
+**Python SDK for the Hawk Daemon API**
+
+[![Python](https://img.shields.io/badge/Python-3.10+-3776AB?logo=python)](https://python.org/)
+[![Type](https://img.shields.io/badge/Type-SDK-blue)]()
+
+</div>
+
+---
+
+## 🎯 Overview
+
+Idiomatic Python client for the hawk daemon HTTP API. Provides both **sync** and **async** clients, SSE streaming, a tool decorator, agent abstraction, and workflow builder. Uses `httpx` for HTTP transport and `Pydantic` for response models.
+
+---
+
+## 🧱 Modules
+
+```
+src/hawk/
+├── __init__.py          📤 Public exports
+├── client.py            🔌 HawkClient (sync) + AsyncHawkClient (async)
+├── types.py             📋 Pydantic models (ChatResponse, Session, Stats)
+├── errors.py            ❌ HawkAPIError base + subclasses, parse_error()
+├── retry.py             🔄 RetryConfig, with_retry_sync(), with_retry()
+├── streaming.py         📡 StreamReader, AsyncStreamReader, StreamEvent
+├── agent.py             🤖 Agent (conversation history, async support)
+├── tools.py             🛠️ @tool() decorator, chat_with_tools()
+├── workflow.py          🔧 Workflow builder
+├── discovery.py         🔍 Auto-discover running hawk daemon on localhost
+├── memory_tools.py      🧠 Memory graph operations (yaad integration)
+├── evaluate.py          📊 Evaluation helpers
+└── tracing.py           📈 OpenTelemetry tracing support
+```
+
+---
+
+## 📤 Client Usage
+
+```python
+from hawk import HawkClient, AsyncHawkClient
+
+# 🔌 Sync client
+with HawkClient(base_url="http://localhost:4590", api_key="sk-...") as client:
+    health   = client.health()
+    response = client.chat("list files in src/")
+    print(response.response)
+
+# 📡 Async client
+async with AsyncHawkClient() as client:
+    async for event in client.chat_stream("explain this code"):
+        print(event.data, end="", flush=True)
+
+# 📋 Sessions
+sessions = client.list_sessions(limit=10)
+msgs     = client.get_session_messages(session_id)
+client.delete_session(session_id)
+```
+
+---
+
+## 🛠️ Tool Decorator
+
+```python
+from hawk import tool, HawkClient
+
+@tool()
+def read_file(path: str) -> str:
+    with open(path) as f:
+        return f.read()
+
+with HawkClient() as client:
+    response = client.chat_with_tools("read config.json", tools=[read_file])
+```
+
+---
+
+## 🤖 Agent (Higher-Level)
+
+```python
+from hawk import Agent
+
+agent = Agent(base_url="http://localhost:4590")
+resp1 = agent.chat("refactor this function")
+resp2 = agent.chat("now add type hints")  # continues same session
+```
+
+---
+
+## ❌ Error Handling
+
+```python
+from hawk.errors import NotFoundError, RateLimitError
+
+try:
+    response = client.chat("...")
+except RateLimitError as e:
+    time.sleep(e.retry_after or 1)
+except NotFoundError:
+    ...
+```
+
+| Error Class | HTTP Status |
+|-------------|:-----------:|
+| `NotFoundError` | 404 |
+| `RateLimitError` | 429 |
+| `InternalServerError` | 500 |
+
+---
+
+## 🔄 Retry & Streaming
+
+| Feature | Behavior |
+|---------|----------|
+| **Auto-retry** | 429, 500, 502, 503, 504 with exponential backoff + jitter |
+| **Retry-After: 0** | Valid — don't retry immediately |
+| **Dual client** | Every method on both `HawkClient` and `AsyncHawkClient` |