1825d767ca
Cherry-pick PR #2271's config refactor onto release/2.0-rc. Used 'git merge -X theirs' to auto-resolve content conflicts in favor of the PR's design (frozen AppConfig + explicit-parameter passing). Limitations: - Release-only changes that overlapped with PR's refactor in 119 files are NOT preserved — those files reflect PR's version. Follow-up commits on this branch will need to re-apply release-only modifications where meaningful. - See PR #2271 for design rationale.