## Turn 1

Here's a thinking process:

1.  **Analyze User Input:**
   - User says: "Reply with exactly this sentence: latency probe complete."
   - Constraint: "Reply with exactly this sentence"
   - Target sentence: "latency probe complete."

2.  **Identify Constraints & Requirements:**
   - The response must be exactly the specified sentence.
   - No extra text, no greetings, no explanations.
   - Follow output format requirements exactly (though none are specified beyond the exact sentence).

3.  **Formulate Response:**
   - Just output: "latency probe complete."

4.  **Verify:**
   - Does it match exactly? Yes.
   - Any extra words? No.
   - Ready.✅