Fix missing break statement causing fall-through in Node content setter

[Copilot]

The OPERATOR case in the content setter was missing a break statement after its nested switch, causing execution to fall through to the FUNCTION case and overwrite operator content.

case NodeType.OPERATOR:
    switch (content) {
        case '+':
            this.#_content = Operator.ADDITION;
            break;
        // ... other operators
        default:
            throw `Attempted to create Operator node with non-operator content. Given: ${content}`;
    }
    break;  // ← Added: prevents fall-through to FUNCTION case
case NodeType.FUNCTION:
    this.#_content = content;
    break;

The default case only catches invalid operators within the nested switch. For valid operators, the nested switch completes successfully and without the outer break, execution continues to line 110.

Changes:

• Added break statement after OPERATOR case (line 108)
• Removed unreachable break after throw statement (line 106)

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[JoshdRod]

Fixed myself.