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Refactor misc.py phases 1 & 2: exceptions.py and devices.py (#352)

* maint #341 extract exception classes from misc.py into exceptions.py

Create hklpy2/exceptions.py with all 10 custom exception classes:
Hklpy2Error, ConfigurationError, ConstraintsError, CoreError,
DiffractometerError, LatticeError, NoForwardSolutions, ReflectionError,
SampleError, SolverError.

Remove the class definitions from misc.py (no re-export shim).
Update all internal imports across source, backend, block, and test
files to import directly from hklpy2.exceptions. misc.py itself
imports NoForwardSolutions and SolverError from exceptions for its
own use in pick_*_solution() and get_solver().

Agent: OpenCode (claudesonnet46)

* maint #342 extract ophyd device helpers from misc.py into devices.py

Create hklpy2/devices.py with 7 ophyd device construction helpers:
VirtualPositionerBase, define_real_axis, dict_device_factory,
dynamic_import, make_component, make_dynamic_instance, parse_factory_axes.

Remove all 7 definitions from misc.py (no re-export shim). Update
internal imports in diffract.py (deferred imports inside creator()) and
test files. dev_i182.py is gitignored and not tracked.

misc.py now imports nothing from ophyd directly except Device
(still needed by ConfigurationRunWrapper).

Agent: OpenCode (claudesonnet46)

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