fix(release): replace release-plz with release-please

[Teakowa]

Summary

• replace the failed release-plz integration with a root-level release-please product release flow;
• maintain one Wright Release PR using version.txt and CHANGELOG.md;
• synchronize Cargo workspace versions, Cargo.lock, and checked-in dist/ metadata;
• preserve the existing release gates, native artifacts, npm/GitHub Packages, and package-manager publication pipeline;
• keep the built-in Actions token for release management and reserve secrets.GH_TOKEN for the cross-repository Homebrew tap.

Why

release-plz attempted to package historical internal workspace dependencies while maintaining the Release PR. Wright is a single product implemented as a non-publishable Cargo workspace, so release automation must not require internal crates to become crates.io packages.

Validation

• python3 scripts/sync-release-version.py --version 0.2.4
• python3 scripts/verify-dist.py
• cargo metadata --locked --no-deps --format-version 1
• JSON/YAML workflow parsing
• git diff --check

The real post-merge Release PR and release cycle remain to be verified by GitHub Actions.

Fixes #169