fix: GPU table correction + OpenProse v0.15 alignment + self-heal rules 7-9

- hello-world: Ensures -> Maintains (v0.15.0 rename).
- zulip-mention-reliability: fold Success Criteria into Maintains postconditions.
- litellm-self-heal: swap gemma/qwen GPU hosts to match actual deployment;
  add Strix Halo 64GB UMA detail; add Rules 7 (roster stuck), 8 (agent keys
  invalid/401), 9 (stale Redis active counter).

zulip-mention-reliability.prose.md

@@ -14,14 +14,13 @@ description: >
 - last_test_result: "pass" | "fail" | "degraded"
 - known_failure_modes: array — History of what went wrong and how it was fixed
 - queue_health: "healthy" | "expired" | "reconnecting"
-
-## Success Criteria
-
-- test_mention_gets_response == true — Send @Abiba Bot test, confirm response within 30s
-- stream_subscription_active == true — Bot is subscribed to #agent-hub and #general chat
-- queue_active == true — PM2's event queue is registered and polling
-- no_echo_loop == true — Bot doesn't respond to its own messages
-- dm_always_works == true — DMs still respond even if streams are broken
+  
+  **Postconditions**
+  - test_mention_gets_response == true — Send @Abiba Bot test, confirm response within 30s
+  - stream_subscription_active == true — Bot is subscribed to #agent-hub and #general chat
+  - queue_active == true — PM2's event queue is registered and polling
+  - no_echo_loop == true — Bot doesn't respond to its own messages
+  - dm_always_works == true — DMs still respond even if streams are broken
 
 ## Known Failure Modes (from History)