41330ce78e
Add local/scripts/fetch-sources.sh for fetching sources by category (core, libs, tools) instead of by config. Fix .gitignore to only track our hand-written source code (branding, core, drivers, gpu, system, wayland, kde categories), excluding fetched vendor source like MC's ported source tree. Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>