Test Autopilot rules on specific messages

Problem
Testing Branch by Autopilot rules on the entire conversation may not reflect the specific message context you want to test. Recreating the same context by resending messages is infeasible.

Request
Add ability to test a rule on a specific message or conversation state to verify it works for that exact context.

Context
This is critical for building accurate branching logic based on Autopilot answers without needing to manually recreate message sequences.