Zygomite

rs3-cache-rs: add discover + explain-interface --data-closure (end-to-end gap-fill)

rs3-cache-rs: port derive-opcode-book + extract-stack-effects to Rust; remove the Python

rs3-cache-rs: port protocol payload survey to Rust; remove the Python

rs3-cache-rs: delete split-scriptrunner.py (completed one-shot)

rs3-cache-rs: delete 4 stale one-shot Python scripts