9927724bf2
The RPM spec had no %changelog section, so 'rpm -q --changelog triangles'
returned nothing and downstream tooling (dnf/yum repoclosure, COPR
audit) flagged the package as low-quality. Add entries for the 6.x
release line (6.1.5, 6.1.4, 6.1.3, 6.1.1, 6.1.0) and 5.3.7.
Skipped v6.1.2: that release was yanked (5c312bb published 2026-07-01,
superseded by 6.1.3). Including it would mislead anyone searching the
changelog for the actual v3-snapshot fix.
Dates match git tag dates. Maintainer identity uses the project email
sami@cryptographic-triangles.org (matches other release metadata).