Update RELEASE.MD#458

Merged

Ipstenu merged 6 commits intorelease_1.4.0from

docs/update-release.md

Mar 16, 2026

Commits on Mar 12, 2026

Update RELEASE.MD to standardize version format for release candidates from `-rcN` to `-RC#` and clarify release process steps. Added instructions for merging production code back into development.
Ipstenu
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