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Adds a dispatch-triggered Release workflow for the plugin: enter a version in the Actions UI and it stamps g:nuwiki_version in plugin/nuwiki.vim, sanity-checks the plugin still sources (+ exposes the stamped version), commits chore(release): X.Y.Z, pushes the vX.Y.Z tag, and publishes a Gitea release with notes. No binary build — the plugin ships none; nuwiki-ls is fetched from nuwiki-rs at install time. Dispatch-only so the self-created tag doesn't double-fire. Updates ONBOARDING (tree, CI/CD, "Releasing the plugin") to match. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>