feat(create,resume,stop): verify and standardize --herdr-session option with full peer review

- Standardize --herdr-session as primary flag with --herdr-server alias across create_session.sh, resume_session.sh, update_yaml_resumed.sh, and stop_session.sh
- Guard HERDR_SESSION_NAME in create_session.sh from being overwritten by workspace slug defaults when explicitly provided
- Forward explicit --herdr-session from resume_session.sh to update_yaml_resumed.sh and force-update row metadata
- Add 5 new Tier 2 component tests covering CLI dry-run parsing, usage matching, default preservation, YAML serialization, and resume propagation
- Update multi-agent-mux-create/SKILL.md documentation
- Verified by autonomous multi-agent loop with unanimous PASS verdicts from Claude and Cline

.agents/skills/multi-agent-mux-create/scripts/create_session.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 # create_session.sh — multi-agent-mux-create 의 부속 스크립트
 # Usage:
-#   bash create_session.sh --workspace <path> --agent <claude|agy|hermes|cline> --role <role> [--session <name>] [--wrapper]
+#   bash create_session.sh --workspace <path> --agent <claude|agy|hermes|cline> --role <role> [--session <name>] [--herdr-session <name>] [--wrapper]
 #
 # 동작:
 #   1) preflight: herdr/claude/agy 가용성, workspace 존재
@@ -35,7 +35,8 @@ Options:
   --session NAME      herdr session name (default: derived from workspace)
   --wrapper           force use of ~/.local/bin/<session> wrapper even if not present
   --dry-run           print commands without executing
-  --herdr-server NAME  specify isolated herdr server name
+  --herdr-session NAME specify isolated herdr session name (alias: --herdr-server)
+  --herdr-server NAME  specify isolated herdr session name (legacy alias)
   --submit-job PROMPT submit a job to multi-agent-mux-delegate-job registry with the given prompt
   --onboard           automatically submit a project alignment/orientation job to the new agent
   --no-onboard        disable automatic onboarding job submission
@@ -136,8 +137,10 @@ LOCAL_BIN="${LOCAL_BIN:-$HOME/.local/bin}"
 WRAPPER="$LOCAL_BIN/$SESSION_NAME"
 
 ws_slug="$(derive_workspace_slug "$WORKSPACE")"
-if [ -z "${HERDR_SESSION_NAME:-}" ] || [ "$HERDR_SESSION_NAME" = "default" ]; then
-  export HERDR_SESSION_NAME="$ws_slug"
+if [ -z "$HERDR_SERVER_OPT" ]; then
+  if [ -z "${HERDR_SESSION_NAME:-}" ] || [ "$HERDR_SESSION_NAME" = "default" ]; then
+    export HERDR_SESSION_NAME="$ws_slug"
+  fi
 fi
 
 # Resolve absolute path of the agent command to prevent herdr PATH inheritance issues (especially on macOS)
@@ -170,8 +173,10 @@ if [ -z "$CMD_FULL" ]; then
 fi
 
 spawn() {
-  if [ -z "${HERDR_SESSION_NAME:-}" ] || [ "$HERDR_SESSION_NAME" = "default" ]; then
-    export HERDR_SESSION_NAME="$ws_slug"
+  if [ -z "$HERDR_SERVER_OPT" ]; then
+    if [ -z "${HERDR_SESSION_NAME:-}" ] || [ "$HERDR_SESSION_NAME" = "default" ]; then
+      export HERDR_SESSION_NAME="$ws_slug"
+    fi
   fi
   case "$AGENT" in
     claude)
@@ -192,7 +197,7 @@ spawn() {
 }
 
 if [ "$DRY_RUN" = "1" ]; then
-  echo "[dry-run] would spawn: herdr session '$SESSION_NAME' in $WORKSPACE (agent=$AGENT)"
+  echo "[dry-run] would spawn: herdr session '$SESSION_NAME' in $WORKSPACE (agent=$AGENT, herdr_session=${HERDR_SESSION_NAME:-default})"
   exit 0
 fi
 
@@ -208,8 +213,10 @@ cleanup_herdr_on_error() {
 }
 trap cleanup_herdr_on_error EXIT
 
-RESOLVED_SERVER="$(resolve_herdr_workspace "$SESSION_NAME" "$WORKSPACE")"
-export HERDR_SESSION_NAME="${HERDR_SESSION_NAME:-$RESOLVED_SERVER}"
+if [ -z "$HERDR_SERVER_OPT" ]; then
+  RESOLVED_SERVER="$(resolve_herdr_workspace "$SESSION_NAME" "$WORKSPACE")"
+  export HERDR_SESSION_NAME="${HERDR_SESSION_NAME:-$RESOLVED_SERVER}"
+fi
 
 # TUI 준비 대기
 if ! wait_for_tui_ready "$SESSION_NAME" "$AGENT"; then