chore: resolve merge conflict with development in CHANGELOG.md

Keep both fixed bullets: L10-L20/L10 line range forms (this branch) and the harness-markup tag-stripping fix (development). Co-Authored-By: siGit Code v1.6.4-acp <noreply@sigit.si>

Seto Elkahfi committed Oct 9, 2026 at 06:11 UTC 21ce621e0dc52b94b357a755e75bb0e381edd3d0

No changes.