test(assignor): fix flaky PyPy CI leg (disable Hypothesis deadline)

[wbarnha]

Problem

Master CI intermittently goes red on the Python pypy3.11 leg. The failure is:

hypothesis.errors.FlakyFailure: … produces unreliable results:
  Falsified on the first call but did not on a subsequent one
hypothesis.errors.DeadlineExceeded: Test took 5103.32ms, which exceeds the
  deadline of 4000.00ms …

in tests/meticulous/assignor/test_copartitioned_assignor.py::test_remove_clients (and its siblings).

Root cause

Those copartitioned-assignor property tests now run on PyPy (the PyPy skipif guards were removed when full PyPy support landed). They carried a fixed 4000 ms Hypothesis deadline. PyPy's JIT warmup makes a single example's timing vary by more than a second, so an example intermittently exceeds 4000 ms on its first run but not on retry — which Hypothesis reports as DeadlineExceeded → FlakyFailure. The assignment produced is perfectly valid; only the timing is nondeterministic. This flakes the (non-required) PyPy leg and turns the master run red.

Fix

Set TEST_DEADLINE = None, disabling the Hypothesis deadline for these four property tests — exactly what the DeadlineExceeded message recommends. These tests assert assignment correctness (validity, stickiness, termination), not performance, so the deadline adds only flakiness. The property assertions are unchanged, and the CI job's own timeout still guards against a genuine hang.

Verification

pytest tests/meticulous/assignor/test_copartitioned_assignor.py → 4 passed (run takes ~5.7 s, confirming examples legitimately approach/exceed the old 4 s deadline). flake8/black clean.

🤖 Generated with Claude Code

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Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.11%. Comparing base (5bf3405) to head (c506022).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #732   +/-   ##
=======================================
  Coverage   95.11%   95.11%           
=======================================
  Files         104      104           
  Lines       11169    11169           
  Branches     1206     1206           
=======================================
  Hits        10623    10623           
  Misses        452      452           
  Partials       94       94           

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