Fixes issue where npx bmad-method install would fail with "Source and destination
must not be the same" when installing to the default .bmad-core directory.
Changes:
- Update getBmadCorePath() to use absolute path resolution
- Add safety check in installer to detect and prevent same-source-destination copies
- Provide clear error message when paths are identical
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Co-Authored-By: Claude <noreply@anthropic.com>