[Copilot]

Summary

• Add a Release workflow triggered only by manual workflow dispatch, choosing the next stable patch version (starting at v2.0.0).
• Reuse the build workflow for tests, distribution ZIP and all platform installers; create an annotated tag and publish a GitHub release only after every build succeeds.
• Include generated release notes, SHA-256 checksums and Actions artifacts; remove automatic releases from push builds and update the documentation.

Validation

• Both workflows pass actionlint.
• Local checks cover version-selection edge cases, version propagation, required assets, checksums and mocked tag/release publishing.
• No real release was triggered.