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gsxdsm 7d2bd9794e FN-7337: make planner chats lazy and archive-scoped

Task planner chats now stay out of global chat history until a user interacts and are retained until task archive.

- Load task planner chat tabs with lookup-only resume before any user send.
- Show task-planner sessions in global Chat only after messages exist, including SSE refresh handling.
- Keep interacted planner chats for done tasks while deleting task-scoped planner sessions on archive.
- Cover chat store deletion, planner tab behavior, route filtering, and chat-list refresh with regression tests.

Files changed:
 .changeset/fn-7337-planner-chat-retention.md       |   7 ++
 docs/dashboard-guide.md                            |   4 +-
 packages/core/src/__tests__/chat-store.test.ts     |  44 +++++++++
 packages/core/src/chat-store.ts                    |  22 +++++
 packages/dashboard/app/api/legacy.ts               |  35 ++++++-
 .../app/components/TaskPlannerChatTab.tsx          |  13 ++-
 .../__tests__/TaskPlannerChatTab.test.tsx          |  91 +++++++++++++-----
 .../dashboard/app/hooks/__tests__/useChat.test.ts  |  41 ++++++++
 packages/dashboard/app/hooks/useChat.ts            |  15 ++-
 .../dashboard/src/__tests__/chat-routes.test.ts    | 105 +++++++++++++++++++++
 .../dashboard/src/routes/register-chat-routes.ts   |  17 +++-
 packages/dashboard/src/server.ts                   |  10 +-
 packages/engine/src/runtimes/in-process-runtime.ts |   8 ++
 13 files changed, 378 insertions(+), 34 deletions(-)

Fusion-Task-Id: FN-7337

Fusion-Task-Lineage: 7ef9ed8f-af2e-4fa9-a2b6-0e8c8a805d5e

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

2026-06-30 23:45:01 -07:00