fusion

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gsxdsm e0ec3d1fbd FN-6368: route task chat steering to active sessions

Ensure task chat messages reach the live execution surface instead of waiting for a future session.

- Track seen steering comments for legacy, step-session, and workflow-step execution paths.
- Forward new task chat steering to active step sessions and workflow step sessions, including parallel step handles.
- Remove misleading inactive-session composer copy and cover the steering paths with regression tests.
- Add a patch changeset for the published Fusion package.

Files changed:
 .changeset/fn-6368-steering-running-session.md     |   5 +
 packages/dashboard/app/components/TaskChatTab.tsx  |  12 +-
 .../app/components/__tests__/TaskChatTab.test.tsx  |  18 +-
 .../src/__tests__/executor-step-session.test.ts    | 108 ++++++++++++
 .../engine/src/__tests__/executor-test-helpers.ts  |   3 +
 .../src/__tests__/step-session-executor.test.ts    |  40 +++++
 packages/engine/src/executor.ts                    | 186 ++++++++++++++-------
 packages/engine/src/step-session-executor.ts       |  16 ++
 8 files changed, 312 insertions(+), 76 deletions(-)

Fusion-Task-Id: FN-6368

Fusion-Task-Lineage: 610a6185-b136-4fea-a4bd-ea78ab5aab47

2026-06-13 09:41:20 -07:00