Claude Code's doctor command now fixes problems itself

Claude Code's /doctor command started fixing problems instead of only listing them, per Claude Code's changelog. That's a shift from advisory to active. Teams running heavy MCP and plugin stacks have had no way to see what all that setup costs them, until now.

It also dedupes local CLAUDE.md files against whatever's already checked into the repo. And it proposes trimming content that can be derived straight from the codebase, rather than kept by hand, per the changelog.

The bigger change ranks skills, MCP servers, and plugins by context cost. Anyone who added a server for one project and forgot about it can now see exactly how much it's taxing every run, per the changelog.

Background subagents also run by default now. Launch one from claude agents and it commits, pushes, and opens a draft PR on its own when the work is done, the changelog notes.

A smaller fix closes a gap: a hook-callback timeout was getting misread as a user rejection. If a custom hook ever made an agent back off mid-task for no clear reason, that's likely why, per the changelog.