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gsxdsm b7604a94bf FN-9041: remove agent state-change activity logs

Remove durable agent state-change events and hide retained state-change rows from activity displays.

- Stop AgentStore update and reconciliation paths from writing state-change activity events.
- Filter historical state-change events in activity stores and panels while retaining live roster notifications.
- Document the retained activity contract, add coverage, and include a patch changeset.

Files changed:
 .changeset/fn-9041-removal.md                      |  7 ++++
 docs/agent-activity-contract.md                    |  4 ++
 docs/architecture.md                               |  2 +-
 docs/dashboard-guide.md                            |  2 +-
 .../src/__tests__/agent-activity-writers.test.ts   | 23 ++++++-----
 packages/core/src/agents/agent-store.ts            | 28 +++++--------
 .../app/components/agentsOrgChartActivity.ts       | 12 ++++++
 .../command-center/AgentActivityPanel.tsx          | 25 +++++++----
 .../__tests__/AgentActivityPanel.test.tsx          | 48 ++++++++++++++++++++++
 .../app/hooks/__tests__/agentActivityStore.test.ts | 39 +++++++++++++++++-
 packages/dashboard/app/hooks/agentActivityStore.ts |  3 +-
 11 files changed, 153 insertions(+), 40 deletions(-)

Fusion-Task-Id: FN-9041

Fusion-Task-Lineage: 532724b1-5945-4904-b5cd-2c27909805de

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

2026-08-14 12:41:03 -07:00