Add a lightweight test-fast pipeline for the public Codeberg mirror so it
shows a build status, defined for both CI systems Codeberg offers:
- .woodpecker.yml (Woodpecker, debian:bookworm)
- .forgejo/workflows/ (Forgejo Actions, node:20-bookworm, runner label docker)
Both run the pure-math suite only (Eigen vendored, GTest via FetchContent;
no CGAL/Boost), using public images and the docker runner label since the
private eulernest ci-cpp image and Pi runner are unreachable from Codeberg.
Docs:
- new doc/architecture/ci-cd.md: two-forge topology, runners, trigger
keywords, mirror mechanism.
- fix stale "codeberg/main ... no CI" claim in contributing.md and bring
the CI table up to date.
- link the new doc from the README doc index.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Tarik Moussa
a2464af8b1