feat(intelligence): Phase 2 学习循环基础 — 触发信号 + 经验行业维度

- 新增 triggers.rs: 5 种触发信号（痛点确认/正反馈/复杂工具链/用户纠正/行业模式）
- ExperienceStore 增加 industry_context + source_trigger 字段
- experience.rs format_for_injection 支持行业标签
- intelligence_hooks.rs 集成触发信号评估
- 17 个测试全通过 (7 trigger + 10 experience)

crates/zclaw-growth/src/experience_store.rs

@@ -42,6 +42,12 @@ pub struct Experience {
     pub created_at: DateTime<Utc>,
     /// Timestamp of most recent reuse or update.
     pub updated_at: DateTime<Utc>,
+    /// Associated industry ID (e.g. "ecommerce", "healthcare").
+    #[serde(default)]
+    pub industry_context: Option<String>,
+    /// Which trigger signal produced this experience.
+    #[serde(default)]
+    pub source_trigger: Option<String>,
 }
 
 impl Experience {
@@ -64,6 +70,8 @@ impl Experience {
             reuse_count: 0,
             created_at: now,
             updated_at: now,
+            industry_context: None,
+            source_trigger: None,
         }
     }
 
@@ -108,6 +116,9 @@ impl ExperienceStore {
         let content = serde_json::to_string(exp)?;
         let mut keywords = vec![exp.pain_pattern.clone()];
         keywords.extend(exp.solution_steps.iter().take(3).cloned());
+        if let Some(ref industry) = exp.industry_context {
+            keywords.push(industry.clone());
+        }
 
         let entry = MemoryEntry {
             uri,