Issue #3636154: Remove CLAUDE.md now that Claude supports AGENTS.md

Angie Byronrequested to merge
issue/drupal-3636154:3636154-remove-claude-md into main

Deletes core/CLAUDE.md. Claude Code 2.1.277 and later loads core/AGENTS.md when no CLAUDE.md exists.

Issue: https://www.drupal.org/project/drupal/issues/3636154

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