refactor: rename agents/ to .agents/

Angie Byronrequested to merge
issue/ai_best_practices-3585375:1.0.x into 1.0.x

Updates all references in README.md and composer.json.

By: Angie Byron angie@webchick.net Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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