memex v0.0.5 — Fix LanceDB disk leak & MCP enhancements

Fix critical compact_vectors bug that caused ~234G disk waste from LanceDB version leak.

🐛 Bug Fixes

• Critical: Fix compact_vectors LanceDB version leak (~234G disk waste)
• Fix time filter being ignored at sessions/talks level
• Fix Windows build: platform-specific parent process check

✨ Features

• Auto-trigger vector indexing after compact
• Session-based archive with atomic main+subagent archiving
• Expose session relations and metadata in MCP responses
• Add session ID filtering and single-message retrieval to MCP
• Add include_summary option to get_recent_sessions MCP tool
• Add hour-level time shortcut support for search_history
• Add parent process monitoring for graceful shutdown

🔧 Maintenance

• Filter system noise messages from MCP search and session results
• Remove agent_client module and event subscription

Full Changelog: v0.0.4...v0.0.5