v7.0.0 — instance + validate promote auto-gate on a path list

Extends the v6.0.0 base-build-scratch fix to instance and validate. Removes
instance.promote_job_rules and validate.job_rules; both gate internally on a
path list (instance reuses build_change_paths, validate gets change_paths) via
.promote-rules / .validate-rules anchors (build rules minus merge_request).
promote and validate-and-promote fire on identical conditions. BREAKING:
removes those two inputs. carmine re-pins and drops its overrides.