[codex] Fix workspace dependency publishing

[haltakov]

What changed

• Replaced changeset publish with a release helper that packs each workspace with Yarn before publishing with npm.
• Validates every packed manifest and fails if any dependency field still contains a raw workspace: range.
• Bumped the publishable packages to 2.1.9 so npm latest can move past the broken 2.1.8 publish.

Why

simple-photo-gallery@2.1.8 was published through npm's pack path with raw workspace protocol dependencies, so npm install -g simple-photo-gallery@latest fails with Unsupported URL Type "workspace:". Yarn's pack path rewrites those ranges correctly; the release flow now uses that packed output.

Validation

• yarn release:dry-run
• git diff --check
• yarn install --immutable
• Inspected the generated 2.1.9 tarball manifests and confirmed simple-photo-gallery depends on @simple-photo-gallery/common: ^2.1.9 and @simple-photo-gallery/theme-modern: ^2.1.9.

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