Limit fabric label to 32 characters with truncation and logging

[Copilot]

• Implement fabric label 32-character limit validation in MatterDeviceController
• Add truncation logic with informative logging for labels exceeding 32 characters
• Create comprehensive test suite for fabric label validation
• Fix lint errors identified in CI (ruff and pylint issues)
• Ensure backward compatibility for existing labels ≤ 32 characters
• Handle edge cases (None values, empty strings, unicode characters)

The implementation now includes:

• Validation in set_default_fabric_label method to check label length
• Automatic truncation to exactly 32 characters for long labels
• INFO-level logging when truncation occurs
• Comprehensive test coverage with 6 test cases
• All lint checks passing (ruff and pylint)

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[Apollon77]

@copilot Please check the lint error from CI - see https://github.com/matter-js/python-matter-server/actions/runs/17355814776/job/49268749287?pr=1229#step:5:1

[Copilot]

@copilot Please check the lint error from CI - see https://github.com/matter-js/python-matter-server/actions/runs/17355814776/job/49268749287?pr=1229#step:5:1

Fixed the lint errors in commit e14a83e. The issues were in the test file I created:

Ruff errors fixed:

• Added missing docstring to __init__ method
• Removed unused imports (asyncio, Mock, MagicMock)
• Fixed formatting issues (blank lines, newline at end)

Pylint errors fixed:

• Added # pylint: disable=protected-access for test file (accessing _default_fabric_label is expected in tests)

All lint checks now pass:

• ruff check - All checks passed
• ruff format - File properly formatted
• pylint - Rated 10.00/10

The fabric label validation functionality and tests work correctly.

[agners]

LGTM