Add lion: documentation extraction tool for Go code

Co-authored-by: neongreen <1523306+neongreen@users.noreply.github.com>

Author: Copilot

lion/internal/extractor/extractor.go

@@ -201,13 +201,16 @@ func parseLionCommentLine(text string) (string, string) {
 	return topic, content
 }
 
-/*lion:implementation
+/*
+lion:implementation
 parseLionBlockComment parses a block comment that starts with lion:topic-name.
 The format allows multi-line content without repeating the topic on each line:
-  /*lion:topic-name
-  Multi-line content
-  can go here
-  *\/
+
+	/*lion:topic-name
+	Multi-line content
+	can go here
+	*\/
+
 This returns the topic name and the full content (with the first line after lion:topic-name).
 */
 func parseLionBlockComment(text string) (string, string) {