remark-lint-heading-whitespace

remark-lint rule that detects non-breaking spaces (U+00A0) inserted accidentally after heading markers (e.g., '# ' instead of '# '), which causes headings to be parsed as plain paragraphs. Version 1.0.0 (latest) is stable and targets the remark-lint plugin ecosystem. No known release cadence. Differentiates from other lint rules by focusing on a specific, localization-driven typo that is common on keyboard layouts like Swiss German where '#' is typed via Alt+3 and Alt+Space produces a non-breaking space. Integrates as a remark-lint plugin.