refactor: update multi-agent rules to TMUX & refactor MAM skills scripts

- Update .agents/MULTI_AGENT_RULES.md & .ko.md to align with TMUX concepts
- Add .agents/INSTALL.md guide for MAM setup and workflows
- Clean up legacy markdown reports under .agents/reports/
- Refactor MAM scripts in .agents/skills/ (rename resolve_herdr_session to resolve_herdr_workspace)
- Improve workspace pane splitting/re-use logic in lib.sh
- Reduce paste safety sleep in send_keys_safe and support linking ~/.claude.json

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

@@ -37,7 +37,7 @@ if [ -z "$UUID" ]; then
   exit 1
 fi
 
-HERDR_SERVER_NAME="$(resolve_herdr_session "$SESSION_NAME")"
+HERDR_SERVER_NAME="$(resolve_herdr_workspace "$SESSION_NAME")"
 export HERDR_SERVER_NAME
 
 # 2. If herdr is alive, print warning or attach.