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gsxdsm daf3f15fd1 FN-7909: add room-level thinking effort override for Chat Rooms

Adds a per-room thinking-effort (reasoning level) override for Chat Rooms so all room responders can share a consistent override instead of relying only on per-agent/global defaults.

- Persist `chat_rooms.thinkingLevel` with a new core DB migration and store read/write support
- Extend chat-store and chat-types with thinkingLevel plumbing for room create/update
- Wire the dashboard chat room API/routes and legacy handlers to accept and return thinkingLevel
- Add a ChatView room settings control (with CSS) and useChatRooms hook support for setting/clearing the override
- Resolve room responder defaultThinkingLevel from the room override when present
- Update docs (dashboard-guide, settings-reference) and add a minor changeset for the feature

Files changed:
 .changeset/fn-7909-room-thinking-level.md          |  7 +++
 docs/dashboard-guide.md                            |  1 +
 docs/settings-reference.md                         |  2 +-
 packages/core/src/__tests__/chat-store.test.ts     | 21 ++++++++
 packages/core/src/__tests__/db-migrate.test.ts     | 57 ++++++++++++++++++++++
 packages/core/src/chat-store.ts                    | 12 ++++-
 packages/core/src/chat-types.ts                    | 10 ++++
 packages/core/src/db.ts                            | 28 ++++++++++-
 packages/dashboard/app/api/__tests__/chat-rooms-api.test.ts       |  8 +--
 packages/dashboard/app/api/legacy.ts               |  4 +-
 packages/dashboard/app/components/ChatView.css     | 16 ++++++
 packages/dashboard/app/components/ChatView.tsx     | 29 ++++++++++-
 packages/dashboard/app/components/__tests__/ChatView.rooms.test.tsx   | 24 +++++++++
 packages/dashboard/app/hooks/__tests__/useChatRooms.test.ts       | 22 +++++++++
 packages/dashboard/app/hooks/useChatRooms.ts       | 16 ++++++
 packages/dashboard/src/__tests__/chat-room-routes.test.ts         | 26 ++++++++++
 packages/dashboard/src/__tests__/chat.rooms.test.ts     | 42 ++++++++++++++++
 packages/dashboard/src/chat.ts                     |  8 +++
 packages/dashboard/src/routes/register-chat-room-routes.ts        | 21 ++++++--
 19 files changed, 338 insertions(+), 16 deletions(-)

Fusion-Task-Id: FN-7909

Fusion-Task-Lineage: 2741eca9-5305-4f6c-81bf-ae644a9fe307

Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-12 22:12:18 -07:00