docs: add descriptive instructions to Code Quality section

- Add requirement to run formatting before submitting code updates
- Emphasize that go fmt must be run before committing changes
- Clarify that formatting ensures consistent code formatting

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Co-authored-by: xgopilot <noreply@goplus.org>

CLAUDE.md

@@ -70,11 +70,15 @@ go test ./...
 
 ## Code Quality
 
+Before submitting any code updates, you must run the following formatting and validation commands:
+
 ### Format code
 ```bash
 go fmt ./...
 ```
 
+**Important:** Always run `go fmt ./...` before committing code changes. This ensures consistent code formatting across the project.
+
 ### Run static analysis
 ```bash
 go vet ./...