Replaces the role-cycle toggle with a slot model toggle in the Context &
Memory panel. The active model label is shown on the button; clicking cycles
through Primary → Backup 1 → Backup 2 slots configured for the Chat role.
- app.js: remove activeRole()/availableRoles role-cycling; add
activeChatModel()/chatModels slot cycling; update send/orchestrate
payloads to send slot + chat_role:"chat"; fix updateSendBtnTitle and
startRunTimer to use activeChatModel()
- chat.py: add slot field to ChatRequest; pass slot= to complete();
resolve backend_label from slot config; add _chat_slot_models() helper;
include chat_models in GET /backend response
- HELP.md: update Model toggle description, tool count (62/16),
Backends section, API chat payload example
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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