Glossary

• ABI (Application Binary Interface): stable binary contract between wrappers and engine C surface.
• Drawlist: versioned, little-endian command stream sent by wrapper to engine.
• Event batch: packed, little-endian event stream produced by engine for wrapper consumption.
• Framebuffer: logical cell grid representing rendered content before terminal diff emission.
• Diff renderer: compares previous and next framebuffer and emits minimal terminal output.
• Damage rectangles: tracked changed regions used to reduce work/output.
• Caps / limits: explicit deterministic bounds that constrain memory/work per frame.
• Reserved field: currently-unused ABI field that must be zero for forward compatibility.
• No partial effects: failure path guarantee that avoids committing half-applied state changes.
• Single flush: one backend write per successful engine_present() call.