PR Review Actioner

Go through unresolved PR review comments, fix what should be fixed, and reply to the rest with a rationale.

Prerequisites

1. gh CLI is installed and authenticated
2. Current directory is a git repository with the PR branch checked out
3. Working tree is clean (no uncommitted changes)

Workflow

1. Find the PR

Detect the PR from the current branch:

gh pr view --json number,url,headRefName,baseRefName