Initial commit: WAFER (WebAssembly Forth Engine in Rust)

Optimizing Forth 2012 compiler targeting WebAssembly with IR-based
compilation pipeline, multi-typed stack inference, subroutine threading,
and JIT/consolidation modes. Rust kernel with ~35 primitives and Forth
standard library for core/core-ext word sets.

crates/core/src/outer.rs

@@ -0,0 +1,24 @@
+//! Outer interpreter: tokenizer, number parser, and interpret/compile dispatch.
+//!
+//! The outer interpreter is the main loop of Forth:
+//! 1. Read a token (whitespace-delimited word)
+//! 2. Look it up in the dictionary
+//! 3. If found: execute (interpret mode) or compile (compile mode)
+//! 4. If not found: try to parse as a number
+//! 5. If number: push (interpret) or compile as literal (compile mode)
+//! 6. If neither: error
+
+// TODO: Step 8 - Outer interpreter implementation
+// - Tokenizer (whitespace splitting, string literals)
+// - Number parsing (decimal, #decimal, $hex, %binary per Forth 2012)
+// - Main interpret/compile dispatch loop
+// - STATE management
+// - EVALUATE support (nested interpretation)
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn placeholder() {
+        // Outer interpreter tests will be added in Step 8
+    }
+}