硬性策略质量门禁 validate_strategy()

新增 STRATEGY_QUALITY_GATES 检查清单（9条红线）：
CRITICAL: 止损/止盈存在+>0, 买入区下沿<上沿
HIGH: 止损≤买入区, 买入推荐含RR≥1.5, 港股标currency=HKD
MEDIUM: signal短词, tech_snapshot含技术位

enforce_strategy_quality() 插在写入链的两处：
1. reassess_with_context() return前 → 单只重评必过
2. regenerate_all() for d in decisions: 写DB前 → 批量重评必过

不过的：status=review_needed, signal降级→信号不充分
不会写进DB/JSON，除非修复了CRITICAL问题

data/stocks/688630.json

@@ -10,6 +10,11 @@
       "time": "2026-06-01T11:55:35.956320",
       "content": "• **688630|芯碁微装|345.68|+3.19%|建议持有观察【短线】|小幅突破，趋势向上，关注350关口**",
       "report_id": "cron_d3797d924ddc_2026-06-01_11-31-32"
+    },
+    {
+      "time": "2026-07-02T08:55:30.347799",
+      "content": "**自选关注：** 芯碁微装(688630) 497.27(-9.49%)已跌破买入区上沿556——若继续下探至430~445可考虑介入。江波龙(301308)667.84(-5.1%)仍在观察。",
+      "report_id": "cron_d42f2ce3b479_2026-07-01_20-14-12"
     }
   ]
 }