Align conftest mock herdr and unit test assertions with Claude's simplified session-based isolation and native herdr command updates

.agents/skills/multi-agent-mux-delegate-job/multi-agent-mux-delegate-job

@@ -23,6 +23,13 @@ elif [[ -f "$SCRIPT_DIR/../../.env" ]]; then
   set -a; source "$SCRIPT_DIR/../../.env"; set +a
 fi
 
+# Source EARLY (before any herdr usage in run_agent) — this is what turns
+# plain `herdr` into the tmux-compat shim (herdr() function) and provides
+# resolve_herdr_workspace/send_keys_safe. Sourcing it late meant the
+# has-session pre-flight check below used to hit the real herdr binary with
+# a nonexistent subcommand and always fail.
+source "$SCRIPT_DIR/../lib.sh"
+
 # Pick an interpreter: prefer a project .venv, else python3.
 pick_python() {
   local py_bin
@@ -429,19 +436,19 @@ run_agent() {
     return 1
   fi
 
-  local _herdr="herdr"
-  if [ -n "${HERDR_SERVER_NAME:-}" ]; then
-    _herdr="herdr -L $HERDR_SERVER_NAME"
-  fi
+  # Auto-resolve isolation the same way resume/stop/create do — don't rely on
+  # the caller having exported HERDR_SERVER_NAME by hand. This is what lets
+  # delegation reach an agent living in an isolated herdr session (e.g. one
+  # created with --herdr-server) instead of silently looking in "default".
+  export HERDR_SERVER_NAME="$(resolve_herdr_workspace "$sess")"
 
-  if ! $_herdr has-session -t "$sess" 2>/dev/null; then
+  if ! herdr has-session -t "$sess" 2>/dev/null; then
     echo "ERROR: 에이전트 세션 '$sess'이 존재하지 않습니다. 작업을 위임하기 전에 먼저 에이전트 세션을 기동해 주세요." >&2
     echo "       팁: 'multi-agent-mux-resume' 또는 'multi-agent-mux-create'를 통해 에이전트를 먼저 생성할 수 있습니다." >&2
     return 1
   fi
 
   # Check role suitability
-  source "$SCRIPT_DIR/../lib.sh"
   local sess_role job_role
   sess_role=$(SESS_NAME="$sess" MAM_STATE_JSON="$(load_state_json)" "$PY" -c "
 import os, json
@@ -499,7 +506,11 @@ else:
     return 1
   fi
   
-  echo "작업이 세션 '$sess'에 전송되었습니다. (연결하려면: $_herdr session attach $sess)"
+  # NOTE: `herdr session attach` operates on whole herdr *sessions* (server
+  # instances), not an individual agent by its MAM name — `agent attach` is
+  # the real command for that. HERDR_SERVER_NAME is inlined so the printed
+  # command is copy-pasteable in a fresh shell that hasn't sourced lib.sh.
+  echo "작업이 세션 '$sess'에 전송되었습니다. (연결하려면: HERDR_SERVER_NAME=$HERDR_SERVER_NAME herdr agent attach $sess — lib.sh를 source한 셸에서 실행)"
   trap - EXIT
 }