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- harness/settings.py: stdlib tomllib loader, [upgrade].skip_canonicals_for_upgrade (bool, default false), _SCHEMA single-source defaults+validation; graceful on absent/malformed (WARN+defaults), warn-and-ignore unknown keys/tables, TypeError on wrong type. Path $CCCI_SETTINGS / /etc/cc-ci/settings.toml. + tracked settings.toml.example. - resolve_upgrade_base: flag true bypasses the canonical lookup -> no-canonical fallback; canonical-present path (incl. samever step-back) unchanged when false. - _no_canonical_base (always-on, §2.C): newest release tag < head (reuse warm_reconcile.newest_older_version) -> main-tip -> skip; replaces jump-to-main-tip. - unit: full resolution matrix + loader tests; 315 unit pass, ruff clean. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>