o: accept sname/aname syntax for new command

data/scripts/o

@@ -251,8 +251,11 @@ cmd_log() {
 
 cmd_new() {
     if [[ -n "$CTX_AGENT" ]]; then
-        echo "error: cannot create nested agents" >&2
-        exit 1
+        # o session/agent new [cwd] — create the agent in that session
+        local agent_cwd="${1:-$PWD}"
+        printf 'name=%s\ncwd=%s\n' "$CTX_AGENT" "$agent_cwd" | ollie-9p write "session/$CTX_SESSION/agent/new"
+        echo "created agent: $CTX_SESSION/$CTX_AGENT"
+        return
     fi
 
     if [[ -n "$CTX_SESSION" ]]; then