- skills/kugetsu/SKILL.md: Agent skill documentation following agentskills.io spec
- skills/kugetsu/scripts/kugetsu: Shell wrapper for opencode session management
- Commands: start, list [--all], resume, stop, help
- State tracking: used → idle (graceful) or left (interrupted)
- Auto-fill message on resume
- Confirmation prompt when resuming used session
- skills/kugetsu/scripts/kugetsu-install.sh: Installation script for users
Implements Phase 1 of issue #11 - basic session management layer
for remote agent control without Hermes dependency.
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