Copilot History Ingest

This pulls your GitHub Copilot CLI session history out of `~/.copilot/session-state` and `session-store.db` (plus VS Code workspace transcripts if you use the extension) and distills it into Obsidian pages. It's designed for people who treat their wiki like a second brain and want their Copilot debugging notes, architecture decisions, and repeated patterns searchable alongside everything else. The smart bit is that it prioritizes checkpoints and summaries over raw conversation turns, so you get signal instead of noise. Works in append mode by default, meaning it only grabs new or updated sessions since the last run. If you're already logging terminal sessions or browser tabs into Obsidian, this closes the loop on your AI pair programming sessions.