Ignore private project task files

Adds explicit public-repo ignore rules for checklist.md and todo task logs so internal planning files do not get published accidentally.

Author: mrfloris

.gitignore

@@ -14,6 +14,10 @@ dist/
 *.sqlite3
 *.db
 
+# Private project notes/task tracking.
+checklist.md
+todo.*.log
+
 *.jar
 *.war
 *.zip