chore: add project documentation framework

.project-docs/30-worklog/task-history.md

@@ -0,0 +1,10 @@
+# Task History
+
+## Completed Tasks
+
+| Date | Task | Outcome | Docs Updated |
+|---|---|---|---|
+
+## Notes
+
+This is legacy integrated history. Feature tasks must not append here. Record new work in `30-worklog/tasks/{task_id}.md`; an integration workflow may render or summarize accepted history later.