#182 DSL Test 7: While Loop Workflow

PROMPT: Create a workflow that initializes a counter at 0, then loops while counter < 3, incrementing the counter each iteration and echoing its value. EXPECTED: tools.simple_counter.init_counter, builder.while_loop with condition, tools.simple_counter.increment_counter in body, proper result_key usage. VALIDATION: Loop executes 3 times, counter reaches 3.