codespar Python SDK v0.1.1

Patch release with two quality fixes.

What changed

• PEP 561 `py.typed` marker — downstream mypy / pyright / pyrefly users now see the SDK's type hints. Without it the types were there in the source but invisible to type checkers.
• `examples/` directory — 5 runnable scripts covering the full surface:
  • `ecommerce_checkout.py` — streaming Complete Loop (4 tools)
  • `pix_payment.py` — blocking send + tool-call summary
  • `proxy_execute.py` — raw HTTP with server-side auth injection
  • `connect_link.py` — OAuth Connect Link generation
  • `async_basic.py` — same flow via `AsyncCodeSpar`

Install surface unchanged — still `pip install codespar`, still `httpx` only.