fix(growth,hands): 穷尽审计后 3 项修复 — browser 文档注释 + experience_store warn 日志 + identity 数字更正

- browser.rs: 过时 doc comment pending_execution → delegated_to_frontend
- experience_store.rs: merge 反序列化失败时 warn!() + fallback 覆写
- wiki/log.md: identity_patterns 43→54 更正

crates/zclaw-hands/src/hands/browser.rs

@@ -1,7 +1,7 @@
 //! Browser Hand - Web automation capabilities (TypeScript delegation)
 //!
 //! **Architecture note (M3-02):** This Rust Hand is a **schema validator and passthrough**.
-//! Every action returns `{"status": "pending_execution"}` — no real browser work happens here.
+//! Every action returns `{"status": "delegated_to_frontend"}` — no real browser work happens here.
 //!
 //! The actual execution path is:
 //! 1. Frontend `HandsPanel.tsx` intercepts browser hands → routes to `BrowserHandCard`