feat: import memories from git commit history

[natedemoss]

Problem

Projects with long git histories have a wealth of decisions and gotchas buried in commit messages, PR descriptions, and merge commits — none of which TeamMind currently captures.

Proposed solution

A teammind git-import command that scans the repo'''s git log and extracts memories from commit messages that match signal language:

teammind git-import              # scan last 200 commits
teammind git-import --limit 500  # scan further back

Implementation

• Use git log --pretty=format:"%H %s %b" to pull commit messages + bodies
• Run the existing scoreAndTag() function from src/extract.ts against each message
• Save anything above the score threshold as a memory tagged with decision or gotcha
• Set created_by to the git commit author
• Skip commits already imported (store processed commit hashes)
• Dedup against existing memories using the existing cosine similarity check

Notes

This gives new team members instant historical context without needing to replay every session.