chore(deps): align QPK pin to 68fcad8c68ab

Automated downstream QPK pin update after QPK_PIN landed on main.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: QuantStrategyLab QPK Sync

qsl.toml

@@ -6,7 +6,7 @@ allow_legacy = false
 
 [qsl.requires]
 quant_platform_kit = "68fcad8c68ab48a1109d99715f8315af449de493"
-us_equity_strategies = "be1a2c9f7c388d4dd78bda6c2dd7ccad0d4b13b4"
+us_equity_strategies = "291033051fec86586eab223142e5b5b2532a43b5"
 
 [qsl.compat]
 bundle = "2026.08.0"