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Eigen is an external find_package(Eigen3 3.4) dependency. Eigen's
same-major-version rule means a bare 3.4 request only accepts 3.x, so 5.x
cannot be used without changing every requester (jfjoch, Ceres, and the
upstream ffbidx). Standardise on Eigen 3.4.x:
- docs: correct the Windows Eigen install recipe to 3.4.0 and note the
same-major constraint; SOFTWARE.md now says 3.4.x (not "3.4 or newer").
- docker/{rocky8,rocky9,ubuntu2204,ubuntu2404}: actually install Eigen 3.4.0
from source to /opt/eigen-3.4 (header-only) and add it to CMAKE_PREFIX_PATH.
The images previously installed no Eigen at all, relying on the obsolete
"CMake fetches it" assumption; a rebuild would have failed at configure.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>