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MAJOR: two major versions (v4 -> v6); breaking notes pending upstream changelog review, recorded in the campaign doc. Campaign 7 catalog sweep. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Nn3VgQk9iwEGgyx6QJ2NvE