docs: update DRAFT_PLAN.md with problem definitions & gRPC justification, move agent rules to .agents/

.mam/install_manifest.txt

@@ -1,3 +1,5 @@
+.agents/AGENT.md
+.agents/AGENT.ko.md
 .agents/skills/multi-agent-mux-stop/scripts/stop_session.sh
 .agents/skills/multi-agent-mux-stop/SKILL.md
 .agents/skills/multi-agent-mux-monitor/scripts/reconcile.sh
@@ -5,6 +7,7 @@
 .agents/skills/multi-agent-mux-delegate-job/mqtt-broker-setup.md
 .agents/skills/multi-agent-mux-delegate-job/requirements.txt
 .agents/skills/multi-agent-mux-delegate-job/multi-agent-mux-delegate-job
+.agents/skills/multi-agent-mux-delegate-job/DELEGATION_TYPES.md
 .agents/skills/multi-agent-mux-delegate-job/README.md
 .agents/skills/multi-agent-mux-delegate-job/scripts/publish_event.py
 .agents/skills/multi-agent-mux-delegate-job/scripts/registry.py
@@ -21,8 +24,6 @@
 .agents/skills/multi-agent-mux-resume/SKILL.md
 .agents/skills/multi-agent-mux-status/scripts/status.sh
 .agents/skills/multi-agent-mux-status/SKILL.md
-AGENT.md
-AGENT.ko.md
 MESSAGING.md
 BOOTSTRAP.md
 BOOTSTRAP.ko.md