docs: task new als zweiten Schreibweg in README und INSTALL nachgezogen (#132)

Files changed:
- INSTALL.md
- README.md

README.md

@@ -241,7 +241,10 @@ action, waiting-fors past their follow-up date, tracker projects with no page,
 active pages with no open loop, someday items gone stale. It stores nothing -
 not even a report file. The `gtd-weekly-review` skill then walks the findings with
 you and turns each one into a decision; `tools/wikitool new project` is what
-gives a new initiative its page and its tracker project under one name.
+gives a new initiative its page and its tracker project under one name, and
+`tools/wikitool task new` files a single open item into the tracker - the
+commitment half of a source that carries both something to know and something
+to do, with no page of its own.
 
 Why the split runs this way, rather than syncing the two:
 [docs/knowledge-and-commitment.md](docs/knowledge-and-commitment.md).