Strip-aspect 5.79" panel (792×272) replaces the page-shaped 7.5" choice.
Reflows the v0.1 screen layout, framebuffer memory budget, and spike 2
acceptance to validate the SSD1683-class controller path or fall back to
a ~300 LoC custom embedded-hal driver.
Sets language (Rust on esp-idf-rs), rejects Ratatui and Gleam+Shore with
reasons, locks the MVP scope to "write, save, push one file" and defines
nine downstream releases so each ships a usable artifact.
