Upgrade controller with simple heuristic optimization

[jdhoffa]

Greedy battery dispatch to minimize forecasting error. Controller should outperform naive version on RMSE.

[jdhoffa]

Acceptance criteria proposal:

• Compare against naive controller on identical seeds/scenarios/horizon
• Metric: RMSE tracking error
• New controller improves median RMSE by >=10% across at least 3 presets
• No increase in feeder limit violations vs naive
• Add benchmark report artifact or test output in CI logs