Add agent-manager-skill

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

skills/agent-manager-skill/SKILL.md

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+---
+name: agent-manager-skill
+description: Manage multiple local CLI agents via tmux sessions (start/stop/monitor/assign) with cron-friendly scheduling.
+---
+
+# Agent Manager Skill
+
+## When to use
+
+Use this skill when you need to:
+
+- run multiple local CLI agents in parallel (separate tmux sessions)
+- start/stop agents and tail their logs
+- assign tasks to agents and monitor output
+- schedule recurring agent work (cron)
+
+## Prerequisites
+
+Install `agent-manager-skill` in your workspace:
+
+```bash
+git clone https://github.com/fractalmind-ai/agent-manager-skill.git
+```
+
+## Common commands
+
+```bash
+python3 agent-manager/scripts/main.py doctor
+python3 agent-manager/scripts/main.py list
+python3 agent-manager/scripts/main.py start EMP_0001
+python3 agent-manager/scripts/main.py monitor EMP_0001 --follow
+python3 agent-manager/scripts/main.py assign EMP_0002 <<'EOF'
+Follow teams/fractalmind-ai-maintenance.md Workflow
+EOF
+```
+
+## Notes
+
+- Requires `tmux` and `python3`.
+- Agents are configured under an `agents/` directory (see the repo for examples).