Function checkBoolean

checkBoolean(
    base: Shape3D,
    tool: Shape3D,
    op: BooleanOpType,
): CheckBooleanResult
Pre-validate operands before a boolean operation.

Checks that both shapes are non-null and topologically valid. Returns a structured report of any issues found.
Parameters
- base: Shape3D
- tool: Shape3D
- op: BooleanOpType
Returns CheckBooleanResult
Example
```
const check = checkBoolean(base, tool, 'fuse');
if (!check.valid) {
  console.warn('Boolean will likely fail:', check.issues);
}
```
- Defined in src/topology/booleanDiagnosticFns.ts:23