* Add monthly manual versioning: VERSION file + release-version workflow
* Version as major.minor (1.0); bump minor monthly, major for breaking
* Clarify BCQuality minor is monotonic and never resets across major bumps
* Align comment with engine X.Y.Z scheme (minor = Z)
* Document BCQuality versioning in README
* Drop PRReviewAgent reference from README versioning section
* Derive release version from git tags, drop VERSION file
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Co-authored-by: wenjiefan <wenjiefan@microsoft.com>
