Index README for upstream-submissions/. Captures:
- Directory layout (3 subdirs, one per series).
- Where the actual patch files live.
- Submission status table (none filed yet).
- Validation gates common to all three series.
- Recommended submission order: vb2-dma-resv first (the
architectural correction the kwin patch's premise depends on),
qt6-base-fourier independently anytime, kwin-fourier last
with reference to the merged/in-flight kernel patch.
- Cadence after submitting: review feedback loop, LTS backport
requests, eventual retirement of the local -fourier packages
once the upstream changes ship.
