fix: Race condition in lazy HTTP client initialization#117
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Replace synchronous `_client` property with async `_get_client()` guarded by `asyncio.Lock` to prevent concurrent coroutines from creating multiple `httpx.AsyncClient` instances. The `close()` method acquires the same lock to avoid races between teardown and initialization.
Poetry 1.x fails on the PEP-621 pyproject.toml introduced in 6d02f5b. Consolidate the two-step install (--no-root + --no-interaction) into a single `poetry install --no-interaction`.
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Replace synchronous
_clientproperty with async_get_client()guarded byasyncio.Lockto prevent concurrent coroutines from creating multiplehttpx.AsyncClientinstances. Theclose()method acquires the same lock to avoid races between teardown and initialization.