Make CI green against the refreshed lock file (renovate #1305) #1455

Renovate's lock file maintenance PR #1305 is red on 15 checks (lint, every unit and system-test job on 3.12-3.14 and windows, 3.11 system tests, codecov/project). Main will break the same way on the next dependency bump, so fix the causes on top of the new lock.

Causes seen in the 2026-10-15 run:

• NumPy 2.5 DeprecationWarning: Setting the shape on a NumPy array has been deprecated raised from epicscorelibs/ca/dbr.py:825 (result.shape = (1,)) inside aioca.caput. pytest turns it into an error, so every ca system test fails (50 failed, 47 errors on ubuntu 3.12 system tests).
• ruff property-docstring-starts-with-verb: 8 errors, in core/_command.py (lines 110, 319), core/_device.py (233, 249), core/_mock_signal_backend.py (61, 100), core/_signal.py (95, 103).
• pyright: 1 error at src/ophyd_async/core/_datatypes.py:170:44, TypeForm[Any] cannot be assigned to parameter datatype: type of get_dtype.
• Unit test tests/unit_tests/core/test_signal.py::test_signal_unknown_datatype[NDArray-...] fails: expected Expected Array1D[dtype], got NDArray[numpy.str_], actual issubclass() arg 1 must be a class (same code path as the pyright error; this one was not on the earlier board).

Acceptance criteria:

• Branch on top of the Lock file maintenance #1305 lock where lint, tox -e type-checking, tox -e tests and all system-test jobs pass on 3.11-3.14, ubuntu and windows.
• CA warning handled narrowly: a filterwarnings entry for that exact message from epicscorelibs, or a numpy<2.5 pin, with a comment linking the upstream issue (open one on epics-base/epicscorelibs or aioca if none exists).
• Property docstrings reworded (noun phrase, not a verb), no behaviour change.
• _datatypes.py:170 fixed so both the pyright error and the NDArray unit test pass.

Pointers: PR #1305 (renovate/lock-file-maintenance); reproduce locally with uv sync on the PR branch then tox -e pre-commit,type-checking,tests. The docstring edits touch _device.py, _signal.py, _mock_signal_backend.py, which #1371, #1399, #1441 also edit: merge this first. _datatypes.py is also near #1393's NDArray work (it edits test_signal.py and _utils.py), so tell its author.

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The code and this description were generated with AI and reviewed/tweaked by the author.