[Lash-L]

Follow up Allen's error-case and logging comments on #1002. Document and test that a missing or null error code stays None, while the protocol's zero (UNKNOWN) and unrecognized firmware codes remain MowerErrorCode.UNKNOWN. Cover dictionary/DPS inputs and serialization round trips without changing the wire meanings.

Log unrecognized mower enum values at debug level before using the existing fallback. Recognized values, including explicit UNKNOWN, and optional lookups stay silent. GPS redaction remains in the separate device-support work.

Validation:

• Mower tests: 127 passed.
• Full suite on Python 3.14: 2,038 passed, 53 xfailed, 11 deselected; 99 snapshots passed.
• pre-commit run --all-files: all hooks passed, including Ruff, Mypy, and Codespell.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
roborock/data/mower/mower_code_mappings.py	100.00% <100.00%> (ø)
roborock/data/mower/mower_containers.py	100.00% <100.00%> (ø)
tests/data/mower/test_mower_code_mappings.py	100.00% <100.00%> (ø)
tests/data/mower/test_mower_containers.py	100.00% <100.00%> (ø)

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