A/B: Causal Chains — Success vs Partial-Success Propagation

Same learn_from_outcome tool, different outcomes: A reports a success — confidence boosted +0.075, Q-value rises 0.5→0.65, then a second success compounds to 0.69/0.755. B reports partial_success — smaller boost (+0.024), Q-value 0.5→0.545. Real MCP payloads showing confidence & Q-value propagation.