Added comprehensive release notes including:
- Summary of the v1.2.1 patch release
- Bug fix details for configurator component substitution
- API price loading implementation
- Testing verification
- Installation instructions for all platforms
- Migration notes (no DB migration required)
Release notes now provide full context for end users and developers.
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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