docs: migrate all build commands to Common Development Tasks

- Add 'Build llgo command specifically' and 'Check llgo version' commands
- Consolidate all build-related commands in one section
- Reduce redundancy by having single section for development tasks

Generated with [codeagent](https://github.com/qbox/codeagent)
Co-authored-by: xgopilot <noreply@goplus.org>

CLAUDE.md

@@ -72,11 +72,21 @@ go vet ./...
 
 ## Common Development Tasks
 
-### Build the project
+### Build the entire project
 ```bash
 go build -v ./...
 ```
 
+### Build llgo command specifically
+```bash
+go build -o llgo ./cmd/llgo
+```
+
+### Check llgo version
+```bash
+llgo version
+```
+
 ### Install llgo for system-wide use
 ```bash
 ./install.sh