RXRE engine v1.5.3 — coherence/content fix

RXRE engine v1.5.3 — coherence/content fix release (2026-11-13).

Content correct w.r.t. claims: this tag's zip contains the P1 strengthening code (test_5b/5c2/5d, test_replay_uses_original_request_payload, evaluate_contract semantic gate, replay executes with request_json payload, test_integridad_adv_final and test_replay_mision aligned) — the same code that was documented but not tagged in v1.5.0..v1.5.2. Doc counts now consistent with the executed gate: 72 passed, 2 skipped.

Verification content: 60-artifact manifest (60 SHA-256s bound), 15 stages, five bounded targets sealed, independent third-party verification remains NOT_EXECUTED. MIT.

Supersedes v1.5.0/v1.5.1/v1.5.2 (tag-rewritable convenience releases with stale README content pointers). All evidence is sealed by manifest of this tag; v1.5.3 README is the authoritative coherence anchor.

ZIP SHA-256: see rxre-engine-1.5.3.zip.sha256.