Fix package facts: themes, counts, versions
Reconcile remaining factual drift against .changeset/config.json (source of
truth for what publishes):
- Remove non-existent packages theme-default / theme-daily / theme-brutalist
(dirs exist but have no package.json; default theme is theme-neutral)
- Release-Process: "12 publishable packages" → 10; stale 0.0.15 → 0.1.1;
drop agent-docs from the CLI command list
- Testing-Example-Apps: theme-default → theme-neutral (pack + dependency)
- System-Architecture: "Four published packages" → ten (core, cli, build,
seven themes)
Co-authored-by: Cursor <cursoragent@cursor.com>