Add anvillm-sessions skill for agent lifecycle management

skills/anvillm-sessions/SKILL.md

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+---
+name: anvillm-sessions
+intent: agents, sessions
+description: Manage agent sessions (create, list, control). Use when spawning new agents, checking agent status, or controlling agent lifecycle.
+---
+
+# Anvillm Session Management
+
+Create and control agent sessions.
+
+## Commands
+
+- `list_sessions.sh` - List all active sessions (JSON)
+- `create_session.sh <backend> <cwd> [role=<role>] [tasks=<task1,task2>] [model=<model>]` - Create new session
+- `control_session.sh <session-id> <command>` - Control session (stop|restart|kill|refresh)
+
+## Backends
+
+- `kiro-cli` - Kiro CLI agent
+- `claude` - Claude CLI agent
+- `ollama` - Ollama agent
+
+## Session Lifecycle
+
+1. Create: `create_session.sh kiro-cli /path/to/project role=developer`
+2. Monitor: `list_sessions.sh` (check state field)
+3. Control: `control_session.sh <id> stop|restart|kill|refresh`
+
+## Session States
+
+- `starting` - Initializing
+- `idle` - Ready for work
+- `running` - Processing task
+- `stopped` - Paused
+- `error` - Failed
+- `exited` - Terminated
+
+## When to Use
+
+- User asks to spawn/create a new agent
+- Need to check agent status
+- Need to stop/restart/kill an agent
+- Coordinating multi-agent workflows
+
+## When NOT to Use
+
+- Sending messages to agents (use anvillm-communication skill)
+- Managing tasks (use beads skill)