chore: 升级 Trellis 并精简规则（09-05-trellis-upgrade-rule-cleanup）

.trellis/spec/guides/index.md

@@ -42,23 +42,16 @@ These guides help you **ask the right questions before coding**.
 - [ ] You're writing similar code to something that exists
 - [ ] You see the same pattern repeated 3+ times
 - [ ] You're adding a new field to multiple places
-- [ ] **You're modifying any constant or config**
+- [ ] You are changing a shared constant or configuration contract
 - [ ] **You're creating a new utility/helper function** ← Search first!
 
 → Read [Code Reuse Thinking Guide](./code-reuse-thinking-guide.md)
 
 ---
 
-## Pre-Modification Rule (CRITICAL)
+## Reference Checks By Risk
 
-> **Before changing ANY value, ALWAYS search first!**
-
-```bash
-# Search for the value you're about to change
-grep -r "value_to_change" .
-```
-
-This single habit prevents most "forgot to update X" bugs.
+Before changing shared contracts, cross-layer constants or configuration, inspect their consumers. A local literal or wording correction does not require a repository-wide search. Read these guides only when the task matches their triggers; do not repeat an unchanged checklist every turn.
 
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