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/cli/src/main.rs

@@ -0,0 +1,41 @@
+//! WAFER CLI: Interactive REPL and AOT compiler for WAFER Forth.
+
+use clap::Parser;
+
+/// WAFER: WebAssembly Forth Engine in Rust
+#[derive(Parser, Debug)]
+#[command(name = "wafer", version, about)]
+struct Cli {
+    /// Forth source file to execute
+    file: Option<String>,
+
+    /// Compile all words into a single optimized WASM module
+    #[arg(long)]
+    consolidate: bool,
+
+    /// Output file for consolidated WASM (requires --consolidate)
+    #[arg(short, long)]
+    output: Option<String>,
+}
+
+fn main() -> anyhow::Result<()> {
+    let cli = Cli::parse();
+
+    match cli.file {
+        Some(ref _file) => {
+            // TODO: Step 9 - Load and execute Forth file
+            eprintln!("WAFER: file execution not yet implemented");
+        }
+        None => {
+            // TODO: Step 9 - Interactive REPL
+            println!(
+                "WAFER v{} - WebAssembly Forth Engine in Rust",
+                env!("CARGO_PKG_VERSION")
+            );
+            println!("Type BYE to exit.");
+            eprintln!("REPL not yet implemented");
+        }
+    }
+
+    Ok(())
+}