Expose background workflow activity events

Bracket each background workflow with lifecycle events and emit its primary
wake before completion so integrations do not report a premature idle state.

1 files changed, 8 insertions, 3 deletions

diff --git a/subagents/workflow.lua b/subagents/workflow.lua
index 671890e..ff534cb 100644
--- a/subagents/workflow.lua
+++ b/subagents/workflow.lua
@@ -748,6 +748,11 @@ local function make_workflow_record(id)
     return record
 end
 
+local function emit(name)
+    local ext = host()
+    if type(ext.emit) == "function" then pcall(ext.emit, name) end
+end
+
 local function notify(record)
     if record.suppress_notification or record.status == "cancelled" then return end
     local primary = host().agent
@@ -755,9 +760,7 @@ local function notify(record)
     local submitted = pcall(primary.submit, primary, string.format(
         "[subagents] Workflow %s %s. Inspect subagents.workflows[%q] with subagents.lua.",
         record.id, record.status, record.id))
-    if submitted and type(host().emit) == "function" then
-        pcall(host().emit, "agent_submission")
-    end
+    if submitted then emit("agent_submission") end
 end
 
 local function finish_workflow(record, status, result, err)
@@ -769,6 +772,7 @@ local function finish_workflow(record, status, result, err)
     active_workflows[record.id] = nil
     progress.workflow_finished(record.tool_call_id)
     notify(record)
+    emit("background_work_end")
 end
 
 -- Start a model-authored workflow on its own coroutine and return before the
@@ -826,6 +830,7 @@ function M.start(wf, opts)
         end
     end)
     progress.workflow_started(record.tool_call_id)
+    emit("background_work_start")
     return id
 end