[h2so4nackl-code]

Python >=3.10 is declared as supported, but existing WebSocket probes raise AttributeError on Python 3.10 because asyncio.timeout is unavailable. The previous CI run reported 8 failed and 5 passed.

Use asyncio.wait_for around the complete connect-and-receive coroutine, preserving one timeout budget per attempt. Catch asyncio.TimeoutError for Python 3.10 while preserving timeout reporting and external cancellation.

Add regression tests for a shared timeout budget across multiple messages and cancellation without retry.

Validation: installed .[dev] in isolated Python 3.10.21, 3.11.16 and 3.12.14 environments; pytest -q: 15 passed on each, with websockets 15.0.1. These are local test results; this branch has no Actions workflow because main has none. The separate CI PR #2 is unchanged.

Only src/api_ws_suite/ws_probe.py and tests/test_ws_probe.py change. No dependency, metadata, README, or workflow changes. No merge performed.