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Fusion Agent aad4b73a47 FN-033: use default chat model for task chat

Task chat now uses the resolved project default while matching general chat controls and session behavior.

- Resolve the effective task-chat model and expose model/thinking selectors in the task chat composer.
- Persist per-session model and thinking overrides through scoped task-chat routes.
- Refresh task-chat UI, documentation, tests, and release metadata for the new behavior.

Files changed:
 .changeset/fn-033-task-chat-default-model.md       |   7 +
 docs/agents.md                                     |   4 +-
 docs/dashboard-guide.md                            |  26 +--
 packages/dashboard/app/api/chat/chat.ts            |  26 +--
 .../dashboard/app/components/TaskDetailModal.tsx   |   4 +-
 .../app/components/TaskPlannerChatTab.css          |  38 ++-
 .../app/components/TaskPlannerChatTab.tsx          | 211 +++++++++++++++++----
 .../__tests__/TaskDetailModal.test-helpers.ts      |   2 +
 .../components/__tests__/TaskDetailModal.test.tsx  |   4 +-
 .../__tests__/TaskPlannerChatTab.test.tsx          | 149 +++++++++------
 .../__tests__/effective-model-resolution.test.ts   |  32 +++
 .../app/components/effective-model-resolution.ts   |  30 ++-
 .../dashboard/src/__tests__/chat-manager.test.ts   |  14 +-
 .../routes-task-planner-chat-session.test.ts       | 210 +++++++++++++++++++
 .../dashboard/src/routes/register-chat-routes.ts   | 116 +++++++----
 15 files changed, 700 insertions(+), 173 deletions(-)

Fusion-Task-Id: FN-033

Fusion-Task-Lineage: 10cffb5e-1a38-47e1-9b29-cd3cb0b99b81

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

2026-08-20 03:56:41 +00:00