README explains what the rewrite covers, how to build, run, install and test it. ARCHITECTURE.md gains a top-down decomposition tree (binary -> runtime/core -> termio/terminal/renderer -> leaf crates) and an updated crate map with the actual internal dependencies, including the crates added during integration (apprt, inspector, onig, bench, build-data). CHANGELOG records the rewrite under Unreleased; no version bump.