feat: scaffold remove command foundations

internal/remove/parser.go

@@ -0,0 +1,34 @@
+package remove
+
+import "strings"
+
+// ParseArgsResult captures parser output for sequential removals.
+type ParseArgsResult struct {
+	Tokens     []string
+	Duplicates []string
+}
+
+// ParseArgs splits, trims, and deduplicates tokens while preserving order.
+func ParseArgs(args []string) (ParseArgsResult, error) {
+	result := ParseArgsResult{Tokens: make([]string, 0, len(args))}
+
+	seen := make(map[string]int)
+	for _, raw := range args {
+		token := strings.TrimSpace(raw)
+		if token == "" {
+			continue
+		}
+		if _, exists := seen[token]; exists {
+			result.Duplicates = append(result.Duplicates, token)
+			continue
+		}
+		seen[token] = len(result.Tokens)
+		result.Tokens = append(result.Tokens, token)
+	}
+
+	if len(result.Tokens) == 0 {
+		return ParseArgsResult{}, ErrNoTokens
+	}
+
+	return result, nil
+}