refactor: rename metadata directory .hermes to .mam in backplane scripts and documents

.agents/skills/tmux-agent-orchestrate-monitor/scripts/watchdog.sh

@@ -12,7 +12,7 @@ fi
 
 JOB_ID="$1"
 WORKDIR="$2"
-LOG_DIR="$WORKDIR/.hermes/jobs"
+LOG_DIR="$WORKDIR/.mam/jobs"
 
 mkdir -p "$LOG_DIR"
 
@@ -49,7 +49,7 @@ except Exception:
 
   (
     cd "$WORKDIR" && timeout 120 .venv/bin/python .agents/skills/tmux-agent-orchestrate-delegate-job/scripts/job_subscriber.py \
-      --job "$JOB_ID" --timeout 120 --idle-timeout 999999 --registry-dir .hermes/jobs > "$LOG_FILE" 2>&1
+      --job "$JOB_ID" --timeout 120 --idle-timeout 999999 --registry-dir .mam/jobs > "$LOG_FILE" 2>&1
     echo "[$(date -u +'%Y-%m-%dT%H:%M:%SZ')] subscriber exited" >> "$LOG_FILE"
   ) &