release: align desktop release versions

[fettpl]

Summary

• Applies semantic-release's computed nextRelease.version to root and frontend package metadata in the release workspace.
• Adds a tested scripts/apply-release-version.mjs helper so Electron Builder sees the GitHub release version.
• Documents semantic-release as the stable desktop release version source of truth in AGENTS.md.

Context

Addresses #148 and supports the Homebrew-readiness umbrella in #140.

The release bot does not commit package-version bumps to protected main. Package metadata is updated only in the GitHub Actions workspace before later desktop packaging steps.

Review Follow-up

• Rebased onto current main after the Local Studio rename.
• Preserved the deletion of CONTRIBUTING.md and moved the release-process paragraph into AGENTS.md.
• Updated root test fixtures from vllm-studio to local-studio.
• Preserved the current root check chain without the removed check:cli script.
• Kept this PR limited to version alignment; macOS asset publishing remains in ci(release): publish macOS desktop assets #150.

Validation

• npm run test:release-version (2 tests)
• Release configuration assertion for the @semantic-release/exec prepare command
• git diff --check origin/main...HEAD
• Mandatory pre-push npm --prefix frontend run check:quality gate passed after the rebase

AI Disclosure

AI assistance was used to inspect the release/versioning setup, implement and test the helper, rebase the branch, and perform the follow-up review. I reviewed the resulting diff and command output before updating this PR.

[0xSero]

Reviewed — the approach is right: exec prepareCmd in the prepare lifecycle, workspace-only version application, no commits to protected main, and the helper + tests look solid. This genuinely fixes the 0.2.x-vs-v1.x mismatch (#148) since electron-builder reads frontend/package.json.

It's now conflicting because main deleted CONTRIBUTING.md (docs consolidated into AGENTS.md/README.md) and the root check script changed (check:cli removed, package renamed to local-studio). Both are trivial to resolve on rebase — please move the release-process paragraph into AGENTS.md, and update the vllm-studio test fixtures to local-studio while you're there.

Happy to merge once rebased.

[fettpl]

@0xSero requested rebase follow-up is complete in 402a5705.

• Rebasing onto current main preserved the CONTRIBUTING.md deletion.
• The release-version guidance now lives in AGENTS.md.
• Root fixtures use local-studio.
• The root check chain no longer reintroduces the removed check:cli command.
• npm run test:release-version passes, and the mandatory pre-push frontend quality gate passed.

GitHub reports #149 mergeable and ready for your review. #150 is stacked on this rebased commit and should be merged after #149.