Create script_v3

🔧 Core Improvements
	•	Forecast Shaping: Buy and sell forecasts are shaped separately with asymmetric uncertainty (buys drift upward, sells drift downward). This makes the model safer and more realistic.
	•	Planner-First Design: Dedicated charging planner (charging_plan_inline) ensures the battery can be filled before peak, with explicit feasibility checks.

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⚡ Decision Logic Overhaul
	•	Priority-Based Rules: Cleaned up and flattened into four clear layers:
	1.	Emergencies (negative FiT, always-sell threshold).
	2.	Peak Prep (planner output + panic fill safeguard).
	3.	Trading (peak import lock, opportunistic sell, AM sell, curtailment avoidance).
	4.	Informational (missed opportunities).

➡️ This makes decisions more predictable and transparent.

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📊 New “Reason” Methodology
	•	Powston decisions.reason() calls replace the old action/code strings.
	•	Each decision now logs action, reason, and context data in a structured way.

	•	Kiosk-friendly output: Instead of cryptic “Chg for Peak” or “Force Sell,” you now get clean human-readable snippets like:
	•	“Need 25 kWh; can get ~30 kWh before 3 pm.”

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🏠 Smarter Behavior
	•	Charging starts earlier if waiting risks missing peak readiness.
	•	Daytime export is only allowed if the sell price beats upcoming buys + margin.
	•	Curtailment avoidance actively discharges if negative FiT is forecast and PV surplus would be wasted.
	•	Panic Fill remains in place (15:00–16:00 window).

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❌ Dropped / Simplified
	•	Removed always_export_rrp wholesale RRP override — Powston now handles this natively.
	•	Overnight “opportunistic buy” logic was dropped in favor of simpler, safer day+peak planning.

Author: rbollar