Google just launched its best AI model at half price and told everyone the exact date the discount dies. Gemini 4 Argon costs $2 per million input tokens and $10 for output right now. On November 30 that doubles to $4 and $20. Google printed the price hike into the launch announcement itself, which almost no company does, because telling customers "this gets twice as expensive in 48 days" is usually terrible marketing. Here it's the whole strategy. Developers are the stickiest customers in…