chore: prune unnecessary code (automated weekly cleanup) - no changes needed

[Miyamura80]

Following the execution of Vulture and manual code review matching the strict criteria in UNNECESSARY_CODE_GUIDELINE.md:

• Vulture identified a few configuration model fields (e.g., example_child, verbose, model_config) which are protected under Rule 8.
• Methods like get_field_value and settings_customise_sources in common/global_config.py are part of PydanticBaseSettingsSource overrides and must be kept.
• setup_logging and DSPYInference are publicly used across various files (CLAUDE.md, tests, etc.) and are properly referenced.

As per Rule 10 in UNNECESSARY_CODE_GUIDELINE.md, if no unnecessary code is found, no PR is created. Therefore, no codebase changes were made in this task.

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PR created automatically by Jules for task 8118379837458368794 started by @Miyamura80

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Summary by cubic

Confirms the weekly unnecessary-code cleanup found nothing to remove; no code or behavior changes. We ran Vulture and a manual review against UNNECESSARY_CODE_GUIDELINE.md. Items flagged were protected fields, required PydanticBaseSettingsSource overrides, or public utilities, so we kept them.

^{Written for commit aec8ade. Summary will update on new commits.}

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