The chisel-releases repository holds the chisel releases that chisel consumes: one Git branch per Ubuntu release, ubuntu-XX.XX (e.g. ubuntu-22.04, ubuntu-24.04, ubuntu-26.04).

main is meta-only: CI, workflows, contributing docs. No slices/ or chisel.yaml on main.
All slice work targets a release branch.
EOL branches are frozen (read-only). Check maintenance.end-of-life in chisel.yaml.
Branch suffix matches chisel.yaml's archives.ubuntu.version: ubuntu-24.04 <-> version: 24.04.

Per-release branch root layout:

chisel.yaml                                    # release manifest
slices/<pkg>.yaml                              # one SDF per package
spread.yaml                                    # spread test config
tests/spread/integration/<pkg>/task.yaml       # integration tests
tests/spread/lib/                              # shared spread helpers
.github/                                       # workflows + CI scripts

Active branches accumulate hundreds of SDFs and keep growing; count a checkout with ls slices/ | wc -l (orientation prints this).

Live release list: run scripts/_orientation.py -- it discovers the branches, their format:, and which are still maintained (end-of-life vs today) -- or the repo README.md.