Function evaluate_structured_condition 

pub fn evaluate_structured_condition(
    condition: &Condition,
    ctx: &ExecutionContext,
    result: Option<&Value>,
) -> Result<bool>

Evaluate a structured condition against ctx + optional tool result.

Behaviour matches the worker’s pre-PR-2b CaseEvaluator::evaluate_condition:

• condition.left resolution order:
  1. "result" → the supplied tool result (or Null if None).
  2. "result.<path>" → JSON path navigation of the result.
  3. Variable lookup via ctx.get_variable(&left).
  4. Template rendering via TemplateEngine::render.
  5. Literal string.
• condition.right is template-rendered against ctx before use.
• Operator semantics match the worker’s inline implementation.

This function is pure and synchronous — no I/O, no async.