refactor: add agent param to notify.ps1, update claude settings

hooks/notify.ps1

@@ -1,7 +1,11 @@
 # Unified hook notifier - forwards all hook events to agent-ui server
-# Claude Code pipes JSON via stdin with session_id, transcript_path, etc.
-# The server routes to the correct agent automatically.
+# Usage: powershell -NoProfile -File hooks/notify.ps1 [agent]
+# If agent is specified, passes ?agent=<name> so the backend knows the source.
+# If omitted, the backend auto-detects from session_id/transcript_path.
+param([string]$agent = "")
 $b = [Console]::In.ReadToEnd()
+$url = 'http://localhost:4101/api/claude-hook'
+if ($agent) { $url += "?agent=$agent" }
 try {
-  Invoke-RestMethod -Uri 'http://localhost:4101/api/claude-hook' -Method POST -Body $b -ContentType 'application/json' -TimeoutSec 3 | Out-Null
+  Invoke-RestMethod -Uri $url -Method POST -Body $b -ContentType 'application/json' -TimeoutSec 3 | Out-Null
 } catch {}