Appendix E/P/M/R. Core derivations + deterministic verification scripts

Appendix E/P/M/R. Core derivations: The four appendices E, P, M, R below are legacy closed-form derivations now TOC-visible so they cannot hide: E is corrected in place to the §13.5.4 canon (banner inside); P and M are active and synchronized with §13; R is SUPERSEDED and kept for the record only (banner inside).

The four appendices E, P, M, R below are legacy closed-form derivations now TOC-visible so they cannot hide: E is corrected in place to the §13.5.4 canon (banner inside); P and M are active and synchronized with §13; R is SUPERSEDED and kept for the record only (banner inside). None of them may be cited against the §13/§14 canon.