[codex] Preserve legacy device model names on read

[bendichter]

fix #2185

Summary

Fixes the read-time remapping path for legacy files where Device.model is stored as a string containing characters such as / or :.

Instead of sanitizing the legacy value, PyNWB now constructs the remapped DeviceModel in HDMF construct mode, matching the normal file-read construction path. This preserves the original model name in memory while still avoiding the user-facing name validation that is meant to prevent invalid newly-created container names.

Root cause

DeviceMapper.model_carg manually created a DeviceModel with DeviceModel(...). That bypassed HDMF's usual read-time in_construct_mode=True path, so AbstractContainer.__init__ rejected legacy model strings containing / or :.

Validation

• PYTHONPATH=src .tox/test-py312-pinned/bin/python -m pytest tests/unit/test_device.py -q
• PYTHONPATH=src .tox/test-py312-pinned/bin/python -m pytest tests/back_compat/test_read.py::TestReadOldVersions::test_read_device_model_str_attribute -q
• Earlier full pinned tox run passed: python -m tox -e test-py312-pinned -- tests/unit/test_device.py (683 tests - OK)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.11%. Comparing base (e92a51b) to head (189a603).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #2186   +/-   ##
=======================================
  Coverage   95.10%   95.11%           
=======================================
  Files          29       29           
  Lines        2943     2948    +5     
  Branches      443      443           
=======================================
+ Hits         2799     2804    +5     
  Misses         86       86           
  Partials       58       58           

Flag	Coverage Δ
integration	72.89% <100.00%> (+0.04%)	⬆️
unit	85.54% <100.00%> (+0.19%)	⬆️

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