feat!: Introduce structured destructuring plans for bindings (#485)

- add a dedicated `compiler/destructuring_planner` feature that precomputes binding plans for assignments, parameters, and `some in` expressions
- enrich `ScopeContext` with same-scope tracking, local scheduling hints, and module globals so the planner enforces := shadowing rules without blocking parent scopes
- wire the planner through compiler, hoist, interpreter, and engine paths while updating binding plan variants and adding query traversal helpers for dependency analysis
- document the new planner architecture and ship interpreter regressions that exercise nested destructuring, shadowing, and error reporting

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

src/number.rs

@@ -489,4 +489,15 @@ mod test {
         let n = Number::from(123456f64);
         assert_eq!(format!("{}", n.format_decimal()), "123456");
     }
+
+    #[test]
+    fn division_matches_high_precision_decimal() {
+        let one = Number::from(1u64);
+        let three = Number::from(3u64);
+        let div = one.divide(&three).unwrap();
+        let from_str: Number = "0.3333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333333"
+            .parse()
+            .unwrap();
+        assert_eq!(div, from_str);
+    }
 }