fix: use schema-valid 'default' object in .contributors.yml

[smorin]

First Update Contributors run failed: Unknown config key(s): /classification/default_category. The schema requires classification.default as an {id, label} object (cross-checked against smorinlabs/py-launch-blueprint's working config). https://claude.ai/code/session_014DjTALJi3LJhYmrdpw6Rej

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📥 Commits

Reviewing files that changed from the base of the PR and between 55395a4 and 18c98c0.

📒 Files selected for processing (2)

• .contributors.yml
• PROJECTS.md

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Pull request overview

Updates the contributors-please configuration to match the tool’s schema requirements for the default classification category, fixing the “Unknown config key(s): /classification/default_category” failure during the Update Contributors workflow.

Changes:

• Replaced classification.default_category: code with a schema-valid classification.default object containing { id, label }.

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