fix(supervise): bound response waits

docs/prds/0035-supervise-wait-bounds.md

@@ -65,8 +65,8 @@ Out of scope:
 
 ## Design
 
-Introduce a supervise response wait budget, for example
-`SUPERVISE_RESPONSE_TIMEOUT_SECONDS`, with a documented default. The existing
+Introduce a supervise response wait budget,
+`SUPERVISE_RESPONSE_TIMEOUT_SECONDS`, with a 30 second default. The existing
 poll loop should stop after that budget and return a normal tool result such as
 `{"status": "pending", "notes": "operator response timed out; proposal remains queued"}`.
 The exact field names should fit the existing response schema so agents can
@@ -96,6 +96,4 @@ Run:
 
 ## Open Questions
 
-- What default wait budget is best for agent ergonomics? A short timeout keeps
-  worker threads free; a longer timeout gives an operator more time to respond
-  inline before the agent has to retry.
+None.