add-newsletter

name	add-newsletter
description	Register an additional Buttondown newsletter alongside any already configured. Captures slug, display name, API key reference, user directory, and optional default flag. Use when the user has a new newsletter to manage from the same Claude Code setup.

Add Newsletter

Adds one entry to newsletters in $DATA_ROOT/config.json.

Steps

1. Load $DATA_ROOT/config.json. If missing, run onboard instead.
2. Ask for:
   • Slug (kebab-case, unique). Reject if it already exists in newsletters.
   • Display name.
   • API key reference (prefer op://...).
   • User directory path (suggest ~/Documents/Buttondown/<slug>/); create if missing.
   • Set as default? If yes, flip every other newsletter's default to false.
3. Write the new entry into config.json atomically (write to config.json.tmp, then mv).
4. Print the updated newsletter list with [default] marker.

Validate the API key reference resolves (op read "$ref" >/dev/null) before saving — fail fast on a typo.