Title is now sourced from the `title` frontmatter field with filename-
derived fallback (slug_to_title). H1 headings are treated as body content.
Added `title` to Frontmatter struct and SKIP_KEYS. Made title_to_slug
pub(super) for reuse across vault submodules.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
