Return the read-only tuning snapshot for the Post-Op Scoring & Re-Tiering algorithm.

Rendered as a fourth section in the admin "Triage Logic" tab. Shape is documented in triage/postop/tuning.py::get_config() and includes hard escalators, positive contributor weights, engagement-audit flags, the delta cap and thresholds, daily check-in / D-X survey / med adherence / video / lost-contact configs, and the cron cadence. Wound-photo-related entries are intentionally absent (PRD §8 out of scope v1).