Achieve 100% Core compliance, implement CATCH/THROW

Core word set: 0 errors on Gerry Jackson's forth2012-test-suite/core.fr
- Fix POSTPONE for non-immediate words via COMPILE, mechanism
- Fix double-DOES> (WEIRD: pattern) with does-body scanning and
  runtime patching via _DOES_PATCH_
- Implement CATCH/THROW exception handling using wasmtime trap
  mechanism with stack pointer save/restore
- 232 tests passing

.github/workflows/ci.yml

@@ -23,9 +23,12 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
 
-      - name: Check formatting
+      - name: Check Rust formatting
         run: cargo fmt --all --check
 
+      - name: Check Markdown formatting
+        uses: dprint/check@v2.2
+
       - name: Clippy
         run: cargo clippy --workspace -- -D warnings