Explain changes

Produce a guided tour of the code you changed this session so the reviewer can step through it in their editor.

1. Determine what you changed this session — run git diff (and recall files you created/edited). Read the surrounding code so explanations are accurate.
2. Decide an importance order: entry points and the most consequential edits first, not alphabetical. Group related edits into coherent steps.
3. For each step write a short title and a markdown explanation of what changed and why (intent over mechanics — one or two sentences).
4. Every file, directory, or symbol you mention in the explanation must also appear in refs — refs render as clickable "Jump to" links under the step; file names in the explanation text are plain text and are NOT clickable. Use the mentioned name as the label and add line when pointing at a specific spot. Also add refs for related places worth visiting even if not mentioned in the text.
5. Call the publish_walkthrough tool (aireviewer MCP server) with { title, steps: [{ file, startLine, endLine, title, explanation, importance?, refs? }] }. All lines are 1-based and paths are workspace-relative.

Prefer 3–8 steps. After publishing, tell the user the tour is ready to start in VS Code.

Per-commit mode

When asked to walk through a range of commits (e.g. "review the last 5 commits", "walk me through branch X"):

1. List them oldest-first: git log --reverse --format='%H %s' <range>.
2. For each commit, read its diff (git show <sha>) and write steps as above, tagging each step with commit: <full sha>. Walk commits oldest→newest; within a commit, order steps by importance.
3. Line numbers must be positions in the file AS OF that commit — verify with git show <sha>:<path>, never the working tree. Each step renders inside a diff of <sha>~1 ↔ <sha> in the editor.
4. Pass commits: [{ sha, subject }] (oldest first) alongside steps. The editor then also shows a "Walkthrough Commits" tree in the Source Control sidebar and change marks in the gutter against the base of the range.