docs: Verify LONG adaptive leverage + update test endpoint

- Created LONG_ADAPTIVE_LEVERAGE_VERIFICATION.md with complete verification
- Logic testing confirms Q95+ = 15x, Q90-94 = 10x (100% correct)
- Updated test endpoint to pass direction parameter (best practice)
- Backward compatibility verified (works with or without direction)
- No regressions from SHORT implementation
- Awaiting first production LONG trade for final validation

app/api/trading/test/route.ts

@@ -75,12 +75,14 @@ export async function POST(request: NextRequest): Promise<NextResponse<TestTrade
     
     // Get symbol-specific position sizing (with percentage support)
     // Test trades use quality score 100 for maximum leverage (manual override)
+    // ENHANCED Nov 25, 2025: Pass direction for direction-specific adaptive leverage
     const { getActualPositionSizeForSymbol } = await import('@/config/trading')
     const { size: positionSize, leverage, enabled, usePercentage } = await getActualPositionSizeForSymbol(
       driftSymbol, 
       config, 
       health.freeCollateral,
-      100 // Test trades always use max leverage (quality 100)
+      100, // Test trades always use max leverage (quality 100)
+      body.direction // Pass direction for adaptive leverage
     )
     
     // Check if trading is enabled for this symbol