Fix review posting timeouts.

.claude/skills/leave-review/SKILL.md

@@ -28,11 +28,16 @@ curl -s --max-time 30 "$BASE/api/repo"
 tab's** review, so there is nothing to choose and no way to leave your review on
 someone else's branch.
 
-Give every call a deadline — `--max-time 30`. The server runs `git` for some of
-these, and a repository being built in another pane can make that slow; a curl
-with no deadline turns that into a tool timeout that says nothing about what
-went wrong. If one does trip, say so and try once more rather than treating it
-as a missing review: the answer was late, not absent.
+Give every call a deadline — `--max-time 30` — so a hung request comes back as
+a curl error rather than a tool timeout that says nothing about what went wrong.
+Every call should answer in well under a second; one that hits the deadline
+means something is wrong, not that the server is busy.
+
+Send every POST with a body, even an empty one (`-d ''`). Without one curl sends
+no `Content-Length`, and older playpen builds wait for a body that never comes:
+the change is applied, but the response never arrives. If a write does time
+out, re-read the comments before retrying: it has probably already landed, and
+posting it again leaves a duplicate.
 
 - `{"open":true,…}` with a `context` object — good, go to step 2.
 - `{"open":false}` or a 409 — this tab has no review pane. Tell the user to open