Merge story 80: remove model/apikey and rate limit notifications from chat UI

Resolves conflict in claude_code.rs — keeps story 62's permission_request
handler alongside story 80's suppression of system/rate_limit events.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.story_kit/work/2_current/80_story_remove_model_apikey_and_rate_limit_notifications_from_chat_ui.md

@@ -0,0 +1,20 @@
+---
+name: "Remove model/apiKey and rate limit notifications from chat UI"
+test_plan: approved
+---
+
+# Story 80: Remove model/apiKey and rate limit notifications from chat UI
+
+## User Story
+
+As a user, I want the chat UI to not show noisy notifications like "[claude-opus-4-6 | apiKey: none]" and rate limit messages, so that the interface is clean and distraction-free.
+
+## Acceptance Criteria
+
+- [ ] The chat UI no longer displays the model/apiKey notification (e.g. '[claude-opus-4-6 | apiKey: none]')
+- [ ] The chat UI no longer displays rate limit related messages
+- [ ] Normal chat functionality is unaffected
+
+## Out of Scope
+
+- TBD