Implements CFOrchClient with allocate() (sync contextmanager) and
allocate_async() (async contextmanager) for cf-orch GPU resource
allocation. Releases allocation on exit; ignores 404 on release;
raises RuntimeError on non-2xx allocation response. Exports
CFOrchClient and Allocation from circuitforge_core.resources.
Note: async test uses unittest.mock rather than httpretty — httpretty
only patches stdlib sockets and does not intercept httpx async (anyio)
transport.
pyr0ball
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