What:
- add linux outputs and source build for summarize; plugin flakes now follow current system
- expand update-tools to handle per-system assets and summarize source/pnpm hash
- include linux checks in garnix and docs updates
Why:
- enable linux users to consume supported tools and summarize via Nix
Tests:
- ubs --diff
- nix flake check
- nix flake check --all-systems
- nix build .#summarize
- ./result/bin/summarize --version
5234375e15