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.

Justfile

@@ -0,0 +1,45 @@
+default:
+    just --list
+
+# Build everything
+build:
+    cargo build --workspace
+
+# Run all tests
+test:
+    cargo test --workspace
+
+# Run Forth 2012 compliance tests
+compliance:
+    cargo test --test compliance -- --nocapture
+
+# Run clippy lints
+clippy:
+    cargo clippy --workspace -- -D warnings
+
+# Check formatting
+fmt:
+    cargo fmt --all --check
+
+# Format code
+fmt-fix:
+    cargo fmt --all
+
+# Run the REPL
+repl:
+    cargo run -p wafer
+
+# Run a Forth file
+run file:
+    cargo run -p wafer -- {{file}}
+
+# Run benchmarks
+bench:
+    cargo bench --workspace
+
+# Full CI check (what CI runs)
+ci: fmt clippy test
+
+# Check compilation without running
+check:
+    cargo check --workspace