[Bug]: CSF-factories do not extract description comment above meta definition

Describe the bug

In CSF3 it was possible to add a block comment above the definition of meta, which would be rendered as a description on the docs page. After the migration to CSF factories these comments are now ignored.

Reproduction link

https://stackblitz.com/edit/github-pfrjsytj?file=src%2Fstories%2FHeader.stories.ts

Reproduction steps

1. Go to the above link
2. Button docs page has a description
3. Header docs page does not

System

Storybook Environment Info:


System:
OS: Linux 7.2 Arch Linux
CPU: (20) x64 12th Gen Intel(R) Core(TM) i7-12700H
Shell: 5.9.2 - /usr/bin/zsh
Binaries:
Node: 26.8.2 - /home/bodo/.local/share/mise/shims/node
Yarn: 1.22.22 - /usr/bin/yarn
npm: 12.0.2 - /home/bodo/.local/share/mise/shims/npm <----- active
pnpm: 11.26.0 - /usr/bin/pnpm
Browsers:
Firefox: 155.0.1
npmPackages:
@storybook/addon-designs: ^11.0.1 => 11.1.4
@storybook/addon-docs: ^10.0.5 => 10.6.0
@storybook/addon-vitest: ^10.0.5 => 10.6.0
@storybook/mdx2-csf: ^1.1.0 => 1.1.0
@storybook/vue3-vite: ^10.0.5 => 10.6.0
chromatic: ^18.0.0 => 18.8.0
eslint-plugin-storybook: ^10.0.5 => 10.6.0
storybook: ^10.0.5 => 10.6.0
npmGlobalPackages:
@storybook/cli: 8.1.4

Additional context

No response