feat(examples): add runnable Python SDK examples

[naruto11eth]

Adds a runnable examples/ package so users can see the SDK in action, mirroring the ts-sdk examples/scripts/ set. Run any with uv run python -m examples.<name>.

• Reads (no creds): list_markets, fetch_market, pagination, market_prices, search
• Account: list_positions (needs only a wallet address)
• Orders: create_market_order, create_limit_order — build and sign locally only, never submitted

Shared lib/ helpers (require_env, find_order_example_market, console.table-style printers) keep output at parity with the ts examples. examples/ is wired into ruff + pyright (strict); all scripts pass both, and the credential-free reads were verified live.

Refs: DEV-134

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Note

Low Risk
Adds documentation and demo scripts only; no changes to SDK runtime, auth, or order submission paths.

Overview
Adds a runnable examples/ package (run via uv run python -m examples.<name>) that mirrors the TypeScript SDK example set: public reads (markets, pagination, prices, search), wallet positions, and local-only limit/market order signing.

examples/lib/ supplies shared helpers (require_env, find_order_example_market, console.table-style printers). examples/README.md documents commands and credential env vars (order scripts sign but do not post).

pyproject.toml extends ruff and pyright src/include to examples so the new scripts are linted and type-checked in strict mode.

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