[FEATURE] /insights should output to a markdown file instead of html page.

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

I'm running Claude Code on a headless server. I ran /insights and it generated an html file in the home directory, not where the code is that I'm working on. Since this is a headless server, having a random html file somewhere no webserver is looking for it make the report hard to get to.

Proposed Solution

1. Allow output to either MD or HTML file.
2. Choose output location

Alternative Solutions

_No response_

Priority

Low - Nice to have

Feature Category

CLI commands and flags

Use Case Example

Whenever I run /insights

Additional Context

_No response_