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gsxdsm 7a50232916 FN-8208: validate agent message recipients before delivery

Prevent false-success agent messages by validating recipients before delivery.

- Wire AgentStore into every send-message tool registration.
- Reject missing or unvalidated agent recipients before persistence or wake-up.
- Add recipient validation coverage and a patch changeset.

Files changed:
 .../fn-8208-send-message-recipient-validation.md   |   7 ++
 .../chat-send-message-agentstore-wiring.test.ts    |  11 ++
 packages/dashboard/src/chat.ts                     |   2 +-
 ...tools-send-message-recipient-validation.test.ts | 116 +++++++++++++++++++++
 packages/engine/src/agent-heartbeat.ts             |   4 +-
 packages/engine/src/agent-tools.ts                 |  24 ++++-
 packages/engine/src/executor.ts                    |   2 +-
 packages/engine/src/step-session-executor.ts       |   2 +-
 8 files changed, 162 insertions(+), 6 deletions(-)

Fusion-Task-Id: FN-8208
Fusion-Task-Lineage: 84752bb8-c9f7-42bd-87c1-9681ac442789
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

2026-07-17 10:07:24 -07:00