fix(audit): Batch 7-9 dead_code 标注 + TODO 清理 + 文档同步

Batch 7: dead_code 标注统一 (16 处)
- crates/ 9 处: growth, kernel, pipeline, runtime, saas, skills
- src-tauri/ 7 处: classroom, intelligence, browser, mcp
- 统一格式: #[allow(dead_code)] // @reserved: <原因>

Batch 7+: EvolutionEngine L2/L3 10 个未使用 pub 函数
- 全部标注 @reserved: EvolutionEngine L2/L3, post-release integration

Batch 9: TODO → FUTURE 标记 (4 处)
- html.rs: template-based export
- nl_schedule.rs: LLM-assisted parsing
- knowledge/handlers.rs: category_id from upload
- personality_detector.rs: VikingStorage persistence

Batch 5+: Cargo.lock 更新 (serde_yaml_bw 迁移)

全量测试通过: 719 passed, 0 failed

crates/zclaw-runtime/src/driver/gemini.rs

@@ -616,7 +616,7 @@ struct GeminiResponseContent {
     #[serde(default)]
     parts: Vec<GeminiResponsePart>,
     #[serde(default)]
-    #[allow(dead_code)]
+    #[allow(dead_code)] // @reserved: deserialized from Gemini API, not accessed in code
     role: Option<String>,
 }
 
@@ -643,7 +643,7 @@ struct GeminiUsageMetadata {
     #[serde(default)]
     candidates_token_count: Option<u32>,
     #[serde(default)]
-    #[allow(dead_code)]
+    #[allow(dead_code)] // @reserved: deserialized from Gemini API, not accessed in code
     total_token_count: Option<u32>,
 }
 

crates/zclaw-runtime/src/nl_schedule.rs

@@ -2,7 +2,7 @@
 //!
 //! Three-layer fallback strategy:
 //! 1. Regex pattern matching (covers ~80% of common expressions)
-//! 2. LLM-assisted parsing (for ambiguous/complex expressions) — TODO: wire when Haiku driver available
+//! 2. LLM-assisted parsing (for ambiguous/complex expressions) — FUTURE: post-release LLM-assisted natural language parsing
 //! 3. Interactive clarification (return `Unclear`)
 //!
 //! Lives in `zclaw-runtime` because it's a pure text→cron utility with no kernel dependency.