fix: relax censor_min_count lower bound from 10 to 0 (#182)

[d-koding]

Overview

Closes #182

Description of changes

Relaxes the censor_min_count lower bound from ge=10 to ge=0 in DataUsage.

The previous hard minimum of 10 blocked legitimate workflows where privacy constraints
do not apply, such as synthetic data, debugging, or LLM feedback visualizations
(e.g. Likert plots). The default value remains 10 so no existing behavior is changed.

• Changed Field(10, ge=10) to Field(10, ge=0) in src/seismometer/configuration/model.py
• Updated docstring with .. versionchanged:: NEXT_VERSION_PLACEHOLDER directive
• Added tests covering values below 10 and rejection of negative values
• Added changelog fragment changelog/182.bugfix.rst

Author Checklist

• Linting passes; run early with pre-commit hook.
• Tests added for new code and issue being fixed.
• Added type annotations and full numpy-style docstrings for new methods.
• For breaking API changes, added .. versionchanged:: NEXT_VERSION_PLACEHOLDER directive to affected docstrings.
• Draft your news fragment in new changelog/ISSUE.TYPE.rst files; see changelog/README.md.

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