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gsxdsm a63cf1c911 FN-6750: harden task chat steering coverage

Verify task chat timestamps and immediate steering delivery across UI, route, and executor surfaces.

- Assert inline and expanded TaskChatTab timestamp parity for agent output and user steering comments.
- Cover steering route wake payloads so assigned agents receive the newest steering comment id immediately.
- Harden executor real-time steering tests for seen-before-inject ordering, queued prompt delivery, duplicate suppression, and empty-comment no-ops.

Files changed:
 .../app/components/__tests__/TaskChatTab.test.tsx  |  79 +++++++++++-
 .../src/__tests__/routes-tasks-ops.test.ts         | 136 +++++++++++++++++++++
 .../src/__tests__/executor-step-session.test.ts    | 116 ++++++++++++++++--
 3 files changed, 316 insertions(+), 15 deletions(-)

Fusion-Task-Id: FN-6750

Fusion-Task-Lineage: 48e1d57d-fd37-4d45-9b98-766c4a2f704d

2026-06-19 22:24:18 -07:00