Move plugin version into .env, fix version-bump workflow to only touch it
The old workflow grepped CMakeLists.txt for the first "VERSION X.Y" match, which was cmake_minimum_required's own version rather than the project's, mangling it to 3.27.0.0 on the first real bump. PLUGIN_VERSION in .env is now the single source of truth for both CMakeLists.txt and flake.nix, and the workflow's bump/commit steps only ever touch that one file. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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