[codex] Make useless Pylint suppressions fail lint

[adamtheturtle]

Summary

• Configure Pylint to fail when useless-suppression is emitted.
• Keep existing useless-suppression enablement and project-specific Pylint settings intact.

Validation

• Parsed pyproject.toml with tomllib.
• Ran pylint --rcfile pyproject.toml --list-msgs-enabled.
• Ran repository commit hooks for the changed file.

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Note

Low Risk
Low risk configuration-only change that may cause CI/lint to start failing if the repo contains outdated # pylint: disable pragmas that no longer suppress anything.

Overview
Updates pyproject.toml to make Pylint exit non-zero when it emits useless-suppression (via MAIN.fail-on). This turns previously non-fatal useless suppression warnings into hard lint failures, forcing removal of redundant pylint disable comments.

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