rename fgj to fj

Module path, binary name, config dir, help text, and docs
all updated from fgj-sid/fgj to fj.

tests/functional/fixtures.go

@@ -228,15 +228,15 @@ func (env *TestEnv) CleanupRepo(owner, repoName string) {
 	}
 }
 
-// GetBinaryPath returns the path to the built fgj binary
+// GetBinaryPath returns the path to the built fj binary
 func (env *TestEnv) GetBinaryPath() string {
 	binaryPath := os.Getenv("FGJ_BINARY_PATH")
 	if binaryPath == "" {
 		// Look for the binary in common locations
 		candidates := []string{
-			"./bin/fgj",
-			"bin/fgj",
-			"/home/romain/work/fgj/bin/fgj",
+			"./bin/fj",
+			"bin/fj",
+			"/home/romain/work/fj/bin/fj",
 		}
 		for _, candidate := range candidates {
 			if _, err := os.Stat(candidate); err == nil {
@@ -248,7 +248,7 @@ func (env *TestEnv) GetBinaryPath() string {
 			}
 		}
 		// If no binary found, return default (will error when executed)
-		binaryPath = "./bin/fgj"
+		binaryPath = "./bin/fj"
 	}
 	return binaryPath
 }