Update .gitignore and Refactor Path Resolution in Config

- Added MULTI_TURN_DESIGN.md to .gitignore to prevent tracking of design documents in the test directory.
- Refactored the LoadWithRoot function in config.go for improved readability by adjusting indentation for the absolute path resolution logic.

.gitignore

@@ -52,3 +52,4 @@ coverage.html
 agent/assistant/hook/*.test.md
 agent/search/TODO.md
 agent/search/job-logs.txt
+agent/test/MULTI_TURN_DESIGN.md

config/config.go

@@ -130,7 +130,7 @@ func LoadWithRoot(root string) Config {
 	if root != "" {
 		cfg.Root, _ = filepath.Abs(root)
 	} else {
-	cfg.Root, _ = filepath.Abs(cfg.Root)
+		cfg.Root, _ = filepath.Abs(cfg.Root)
 	}
 
 	// App Root