ci: publish to npm on GitHub Release

[proxymeshai]

Summary

• Publish to npm automatically when a GitHub Release is published.
• Validate that the release tag matches package.json version.

Test plan

• Create a draft release with a mismatched tag and confirm the workflow fails at the version check.
• Publish a release with tag vX.Y.Z matching package.json and confirm npm publish runs (requires NPM_TOKEN secret).

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