feat(script-analysis): predict outbound calls as ApiCall/DbCall/Notify on the External lane

FlowShapePredictor emits ExternalSystem.Call/CachedCall → ApiCall ('{s}.{m}'),
Database.Execute/Query/QuerySingle/CachedWrite → DbCall ('{conn} · {member}'),
Notify.Send(list) and Notify.To(list).Send() → Notify ('Notify {list}'), all on
FlowLane.External; Async-suffixed spellings map identically. PredictedEdge gains
an additive Async flag; an async edge (cached call, notify) does not advance the
chain, mirroring FlowGraphBuilder.IsAsync (D4/D8). Database.Connection() raw
handles no longer predict a node (command count is not statically knowable).

Claude-Session: https://claude.ai/code/session_01NcMG6xXdsJbmD2wYAgkK29

docs/plans/2026-09-06-flow-debugger-outbound-calls.md.tasks.json

@@ -26,7 +26,7 @@
     {
       "id": 3,
       "subject": "Task 3: Site runtime \u2014 outbound rows flow through the trace collector",
-      "status": "in_progress",
+      "status": "completed",
       "blockedBy": [
         0
       ]
@@ -50,7 +50,7 @@
     {
       "id": 6,
       "subject": "Task 6: FlowShapePredictor \u2014 three kinds on the External lane, async edges",
-      "status": "pending",
+      "status": "in_progress",
       "blockedBy": [
         0
       ]
@@ -58,7 +58,7 @@
     {
       "id": 7,
       "subject": "Task 7: FlowGraphView \u2014 External lane, status pills, async/spawn edge styles, pending state",
-      "status": "pending",
+      "status": "in_progress",
       "blockedBy": [
         0,
         1,
@@ -96,5 +96,5 @@
       ]
     }
   ],
-  "lastUpdated": "2026-09-06T05:47:05.104042+00:00"
+  "lastUpdated": "2026-09-06T05:51:19.355720+00:00"
 }