Add complete homelab agents structure, templates, and sysadmin-session-closer agent

agents/README.md

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+# Agents
+
+Agent prompt definitions for use across the homelab.
+
+## sysadmin-session-closer
+Automatically closes development sessions and creates session summaries.

agents/sysadmin-session-closer.md

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+# Sysadmin Session Closer Agent
+
+Automatically closes development sessions and generates session summaries.
+
+## Purpose
+This agent monitors active development sessions and automatically:
+1. Detects when a session is ending
+2. Captures session context and changes
+3. Generates a comprehensive session summary
+4. Updates git repositories with changes
+5. Cleans up temporary files
+
+## Features
+- Automatic session detection
+- Git integration for repository changes
+- Session summary generation with timestamps
+- Support for both homelab-agents and VPS project repositories
+- Intelligent change detection