[sdk] Publish Python SDK to PyPI

[kaynor]

Goal

Package and publish packages/sdk-python for pip install.

Acceptance criteria

• CI publish workflow on release tag
• README install instructions updated

[aaameobius-crypto]

Publishing a Python SDK to PyPI is straightforward. Here's the minimal setup:

# pyproject.toml
[build-system]
requires = ["hatchling"]
build-backend = "hatchling.build"

[project]
name = "agent-voir"
version = "0.1.0"
requires-python = ">=3.10"

[tool.hatch.build.targets.wheel]
packages = ["src/agent_voir"]

# .github/workflows/publish.yml
name: publish
on:
  release:
    types: [published]
jobs:
  publish:
    runs-on: ubuntu-latest
    permissions:
      id-token: write  # for Trusted Publishing
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
      - run: pip install build && python -m build
      - uses: pypa/gh-action-pypi-publish@release/v1  # OIDC, no token

Use Trusted Publishing (no API token needed) — set up the publisher on PyPI settings to point to this repo's release workflow.

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