Same isinstance/cast narrowing and Optional-field assert pattern as the
prior commits, covering the airconditioner, fridge, washer, operational,
subdevices, sensor_hysteresis, laundry, select_options, identity and
entities test files.
Adds [tool.ruff] and [tool.ty] config to pyproject.toml with a curated
ruff rule set (E, F, W, I, UP, B, C4, SIM, RUF, ASYNC, LOG, G, PIE, RET,
PERF, N), pins ruff/ty in requirements-dev.txt, reformats the whole tree
with `ruff format`, and fixes the pre-existing lint and type-check debt
those tools surfaced so both run clean.
Production-code type fixes include: HA's ConfigFlowResult vs. the
generic FlowResult in config_flow.py, narrowing BoundEntity.desc to its
platform-specific subclass (SelectDesc/NumberDesc/SensorDesc/etc.) via
cast() instead of an unchecked annotation, converting HA device_class
strings to their proper enum types, a resolve_registry callback typed
as `object` instead of `DeviceRegistry | None`, and a couple of other
narrow correctness fixes (CA key type validation, an index-out-of-bounds
false positive from an empty-tuple fallback, a bool/dict argument swap).
Test-file fixes are mechanical: narrowing SamsungEntityDescription to
the correct subclass via isinstance()/cast() before accessing
subclass-only fields, and asserting Optional write_fn/unit_fn fields
are set before calling them.
The gate holds finish_time at its last reported value until a new one
differs by at least a configured number of minutes, regardless of how
long that difference has been building up -- a magnitude-based deadband,
not a time-based debounce (which would wait for the value to stay put for
N minutes before accepting it). debounce invited the wrong mental model
for anyone reading the option name or the code later, so rename it
throughout before the option name ships: CONF_FINISH_TIME_DEBOUNCE_MINUTES
-> CONF_FINISH_TIME_HYSTERESIS_MINUTES, SensorDesc.debounce -> hysteresis,
LocalThingsSensor._debounce/_debounced_value -> _apply_hysteresis/
_hysteresis_value, and the options-flow data key/translations to match.
Marc Billow