fix(refactor): address reviewer findings R-1..R-8, achieve 31/31 test pass

.agents/skills/multi-agent-mux-resume/scripts/resume_session.sh

@@ -44,7 +44,7 @@ if [ -z "$UUID" ]; then
   exit 1
 fi
 
-HERDR_SESSION_NAME="$(resolve_herdr_session "$SESSION_NAME")"
+HERDR_SESSION_NAME="$(resolve_herdr_session "$SESSION_NAME" "$WORKSPACE")"
 export HERDR_SESSION_NAME
 
 # 2. If herdr is alive, print warning or attach.

.agents/skills/multi-agent-mux-resume/scripts/update_yaml_resumed.sh

@@ -37,7 +37,7 @@ done
 [ -n "$UUID" ]        || { echo "ERROR: --uuid required" >&2; exit 2; }
 [ -f "$AGENT_SESSIONS_YAML" ] || { echo "ERROR: $AGENT_SESSIONS_YAML not found" >&2; exit 1; }
 
-HERDR_SESSION_NAME="$(resolve_herdr_session "$SESSION_NAME")"
+HERDR_SESSION_NAME="$(resolve_herdr_session "$SESSION_NAME" "${WORKSPACE:-}")"
 export HERDR_SESSION_NAME
 
 # --agent 미지정 시 이름 suffix 로 fallback (P1-F: 가능하면 --agent 명시)