v1.0.1 — single self-contained file

Fixes the offline-libs loading error (#1). Generated maps are now a single self-contained HTML file by default — the d3 + markmap libraries are inlined into the page, so a map opens offline anywhere it's moved, shared, or viewed, with no sibling vendor/ folder to keep alongside it. Pass inline=False for the smaller vendor-folder bundle.

Also in this release

• MIT LICENSE added.
• Adversarial-review fixes: frontmatter rewrite preserves comma-bearing list values; guard against a duplicated markmap: key; _count_nodes skips code fences / non-headings; write_mindmap rejects a non-.html path (no silent source clobber); render_markmap takes a toolbar kwarg.
• Docs: references/internals.md rewritten to the vendored-offline + inline architecture; offline-LaTeX limitation noted.
• 41 dependency-free regression checks (was 33); inline render browser-verified.