revert: undo subagent filtering changes

src/lib/graph-layout.ts

@@ -63,7 +63,7 @@ export function layoutGraph(
   const isHorizontal = direction === 'LR' || direction === 'RL'
 
   // Build session hierarchy and columns
-  const allSessions = nodes
+  const sessions = nodes
     .filter((n) => n.type === 'session')
     .map((n) => n.data as unknown as MonitorSession)
 
@@ -75,17 +75,6 @@ export function layoutGraph(
     .filter((n) => n.type === 'exec')
     .map((n) => ({ id: n.id.replace('exec-', ''), data: n.data as unknown as MonitorExecProcess }))
 
-  // Filter out empty subagent sessions (no actions or execs attached)
-  const sessions = allSessions.filter(s => {
-    const isSubagent = s.key.includes('subagent')
-    if (isSubagent) {
-      const hasActions = actions.some(a => a.data.sessionKey === s.key)
-      const hasExecs = execs.some(e => e.data.sessionKey === s.key)
-      return hasActions || hasExecs
-    }
-    return true
-  })
-
   const crabNode = nodes.find((n) => n.type === 'crab')
 
   // Build session column map - which column is each session in?