Fleet tasks deliberately do not create AgentSession records.
AgentSession's work_log / artefacts / handoff / replay semantics are
designed for interactive, replayable, handoff-capable work — fleet
tasks are atomic assign→complete events with no in-between state
to replay. If a fleet-task handler needs session semantics, it
should start its own AgentSession via AgentSessionService when the
work begins.
Closes tasks.lthn.sh/view.php?id=94
Co-authored-by: Codex <noreply@openai.com>
Co-Authored-By: Virgil <virgil@lethean.io>