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gsxdsm 6bd178bdcf FN-8864: add durable agent activity stream

Add a persisted, project-scoped agent activity feed with query and live delivery surfaces.

- Store sequenced, attributed activity events with privacy-safe metadata and retention.

- Emit activity across agents, workflow execution, reviews, approvals, merges, and recovery.

- Provide paginated API history and resilient SSE tailing with coverage and documentation.

- Renumber the activity migration to 0049 after reconciling main’s 0048 GitHub check-state migration.

Files changed:

 .changeset/fn-8864-agent-activity-events.md        |   7 +
 docs/architecture.md                               |   8 +
 docs/diagnostics.md                                |   4 +
 docs/storage.md                                    |   1 +
 .../__tests__/agent-activity-attribution.test.ts   |  21 +
 .../agent-activity-metadata-hygiene.test.ts        |  60 +++
 .../src/__tests__/agent-activity-writers.test.ts   |  94 +++++
 .../postgres/agent-activity-events.pg.test.ts      |  57 +++
 .../src/__tests__/postgres/schema-applier.test.ts  |  34 +-
 packages/core/src/agents/agent-store.ts            |  24 ++
 packages/core/src/agents/approval-request-store.ts |  15 +-
 packages/core/src/index.ts                         |   4 +
 .../0049_fn_8864_agent_activity_events.sql         |  24 ++
 packages/core/src/postgres/schema-applier.ts       |  15 +-
 packages/core/src/postgres/schema/project.ts       |  19 +-
 packages/core/src/store.ts                         |  17 +
 .../core/src/task-store/agent-activity-outbox.ts   |  75 ++++
 .../src/task-store/async/async-agent-activity.ts   |  71 ++++
 packages/core/src/types.ts                         |   2 +
 packages/core/src/types/agents/agents.ts           |  79 ++++
 packages/dashboard/app/api.ts                      |  54 +++
 .../src/__tests__/agent-activity-route.test.ts     |  68 ++++
 .../src/__tests__/sse-agent-activity.test.ts       | 315 +++++++++++++++
 packages/dashboard/src/routes/README.md            |   2 +-
 .../src/routes/register-setup-activity-routes.ts   |  19 +-
 packages/dashboard/src/sse.ts                      | 139 ++++++-
 .../src/__tests__/agent-activity-writers.test.ts   | 442 +++++++++++++++++++++
 packages/engine/src/executor.ts                    | 110 ++++-
 packages/engine/src/merger.ts                      |  15 +-
 packages/engine/src/self-healing.ts                |  35 +-
 30 files changed, 1809 insertions(+), 21 deletions(-)

Fusion-Task-Id: FN-8864
Fusion-Task-Lineage: 4938f35b-a0bc-4eb3-905c-178fed859cc6
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-08-09 14:39:17 -07:00