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docs: clarify UCP core release versioning contract
- #614
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docs: clarify UCP core release versioning contract
#614
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Commits on Jul 20, 2026
clarify UCP core release versioning contract
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clarify mixed profile and breaking change policies
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clarify platform choice among supported protocol versions
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parallel negotiations across supported versions
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tighten versioning prose, scope backport exception
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cache skew, consumer validation, hosting policy
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