feat: implement remove command with sequential removals

internal/remove/engine.go

@@ -0,0 +1,36 @@
+package remove
+
+import "strings"
+
+// Result captures the outcome of applying sequential removals to a candidate.
+type Result struct {
+	Candidate    Candidate
+	ProposedName string
+	Matches      map[string]int
+	Changed      bool
+}
+
+// ApplyTokens removes each token sequentially from the candidate's basename.
+func ApplyTokens(candidate Candidate, tokens []string) Result {
+	current := candidate.BaseName
+	matches := make(map[string]int, len(tokens))
+
+	for _, token := range tokens {
+		if token == "" {
+			continue
+		}
+		count := strings.Count(current, token)
+		if count == 0 {
+			continue
+		}
+		current = strings.ReplaceAll(current, token, "")
+		matches[token] += count
+	}
+
+	return Result{
+		Candidate:    candidate,
+		ProposedName: current,
+		Matches:      matches,
+		Changed:      current != candidate.BaseName,
+	}
+}