feat(hugo): draft picker, preview toggle, publish command

Put the full Hugo workflow inside Emacs. All of it lives in modules/hugo-config.el.

New functions:
- cj/hugo-open-draft reads all .org files under content-org/log, finds those with #+hugo_draft: true, and offers a completing-read picker.
- cj/hugo-preview toggles a local hugo server subprocess and opens the preview URL in the browser. A second press stops the server.
- cj/hugo-publish opens magit-status on the website repo. The server-side post-receive hook on cjennings.net already rebuilds and deploys on push, so committing and pushing is the deploy.

Two pure helpers support the picker: cj/hugo--post-metadata parses the front matter region of a post, and cj/hugo--collect-drafts walks a directory and filters to drafts. Seven ERT tests cover both helpers across normal, boundary, and error cases.

Keybinding note: C-; h d and C-; h D have swapped roles. Lowercase d now opens the draft picker. Uppercase D toggles the draft flag in the current buffer. The previous lowercase-d binding was toggle.

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