Two interacting bugs caused asyncio.sleep to be mocked globally,
letting tarpit_watcher_worker spin the event loop on a non-async
mock and accumulate _increment_mock_call records without bound:
1. test_ingester.py patched `decnet.web.ingester.asyncio.sleep` via
the asyncio singleton — any code in the process using asyncio.sleep
(including the tarpit worker) hit the fake_sleep side_effect.
Fix: add `_sleep = asyncio.sleep` alias in ingester.py and patch
`decnet.web.ingester._sleep` instead — scopes the mock to ingester.
2. test_api_startup_guards.py called `_run_lifespan_startup` without
DECNET_CONTRACT_TEST=true, which started the real tarpit task in a
manually-constructed event loop that the tests never cancelled.
Fix: set DECNET_CONTRACT_TEST=true inside _run_lifespan_startup so
the lifespan skips all background workers.
anti
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