vibe-qc 0.4.1 — Arch / Manjaro install fixes
Patch release. Five fixes to scripts/build_*.sh and docs/installation.md
that unblock the published install workflow on Arch / Manjaro
(CMake 4.x + Eigen 5 + libint 2.13.1 + system Boost):
- build_libint.sh: dep-detection rewritten to use pkg-config + find,
fixing the Eigen-5 false-negative on Arch.
- build_libint.sh: -Wno-dev silences libint's pre-CMP0167 FindBoost
chatter.
- build_libint.sh: success message points at setup_native_deps.sh.
- build_{libxc,spglib,fftw,libecpint}.sh: pass
CMAKE_POLICY_VERSION_MINIMUM=3.5 (CMake 4.x dropped pre-3.5
compat; libxc 7.0.0 / FFTW 3.3.10 / vendored libecpint deps need
this until upstream bumps their declared minimums).
- docs/installation.md: Arch / Manjaro section confirms Eigen 5 is
fine; release_process.md gains a 'Cutting a patch release'
workflow.
No library code changes. All 879 tests pass at v0.4.0 baseline.