Agent Skills: mining-session-skills

Review one completed Claude Code session and propose a skill to create, update, or reuse so similar work goes faster next time. Use when the user asks to "mine a session for skills", "what skill can be created or updated from the session where I…", "extract a skill from this chat", or to review a past session for reusable workflows. Operates on exported session markdown from claude-session-manager. Not for exporting/converting sessions (use claude-session-manager) and not for writing blogs or TODOs from sessions.