release-mechanics

Use when touching anything release-shaped — version bumps, tags, draft releases, npm publish and provenance, the build-engine feature matrix, release/* PRs, bun link, or CI jobs that download a published engine. Explains why CLI and engine version independently, why tag names are one-use, why draft assets 404 for anonymous clients, and how Greptile re-review and auto-merge behave. To actually cut a release use the…