Explain Yesterday Changes

Summarize yesterday's work.

Goal

Return a simple list of what changed or was implemented. Avoid developer-only details.

Flow

1. Verify current directory is a git repository.
2. If today is Monday, ask the user whether to use Friday instead of yesterday.
3. Inspect commits from the target day using local git history.
4. If commits are missing or unclear, inspect diffs for files changed on the target day when available.
5. Group related changes into user-visible outcomes.
6. Translate technical changes into editor/admin language.
7. Mention uncertainty when git history cannot prove the change.