Revert incorrect simulation loop formula

TEST RESULTS PROVED:
- OLD: remainingUSDC = tokens * F * price → 16,283 tokens, 6.51x (CORRECT)
- NEW: remainingUSDC = tokens * F → 6.6M tokens, 2659x (EXPONENTIAL, WRONG)

Root cause: Simulation uses simplified leverage model, not exact protocol mechanics.
- Simplified: borrow F * (token value) in USDC → geometric series (1-F^n)/(1-F)
- Protocol: borrow F * (collateral sets) in USDC → different mechanics

Keeping:
- Runway validation (prevents debt > collateral)
- Improved loop formula (old returned Infinity)
- Protocol documentation (helps integrators understand real mechanics)

Clarified comments to distinguish simulation model from protocol mechanics.

Author: Genmin

src/sdk.ts

@@ -185,9 +185,9 @@ export class ForecastLeverageSDK {
         const tokensThisLoop = remainingUSDC / params.currentPrice;
         totalTokens += tokensThisLoop;
 
-        // Protocol lends F per $1 of collateral (1 YES + 1 NO = $1)
-        // CRITICAL: Each token pair is worth $1, NOT token price
-        remainingUSDC = tokensThisLoop * leverageParams.F;
+        // Simplified leverage model: borrow F * (token value) in USDC
+        // This creates convergent geometric series: capital * (1-F^n)/(1-F)
+        remainingUSDC = tokensThisLoop * leverageParams.F * params.currentPrice;
 
         if (remainingUSDC < 1) break;
       }