Language Overview

Scope here:

• ecky/cad exported CAD forms and ops
• ecky/core helper functions shipped with Ecky
• ecky/params parameter forms
• lowerer-visible keywords people otherwise guess from source

Out of scope here:

• full Steel standard library reference
• backend implementation internals
• UI behavior outside .ecky authoring

Mental model:

• .ecky is Scheme surface syntax
• compiler lowers it into Core IR
• verifier checks value kinds and op signatures
• native execution maps Core IR into OcctPlan, then the precompiled Direct OCCT runner; FreeCAD lowering is optional interop

Read this order if new:

• Forms and Structure
• Params and Controls
• Primitive Signatures
• Boolean and Transform Signatures
• Surface and Path Signatures
• Array and Frame Signatures
• Special / Custom Operations
• Selector Strings and Named Keywords