chore(deps): bump mdast-util-to-markdown to 2.2.2 - #9899

Summary

• Bump mdast-util-to-markdown 2.1.2 → 2.2.2 (direct dependency of apps/docs). The lockfile still holds a single deduped copy, so this also upgrades the serializer behind remark-stringify in apps/sim (Markdown export image rewriting) and the mdast-util-gfm* / mdast-util-mdx* extensions.
• Upstream fixes in the range: no more needless escaping of intraword _ (snake_case instead of snake\_case), attention next to astral characters/emoji, escaping inside autolinks, & in fenced-code info/meta, "escape after unsafe character", html kinds, and a quadratic position-lookup fix. 2.2.0 adds optional before/after/unicode fields to Unsafe patterns, which is additive.
• No Sim code changes. apps/docs/package.json is part of the docs compile cache's pipeline hash, so the cached .md output regenerates with the new version.

Type of Change

• Other: dependency upgrade

Testing

I wrote a scratch harness that imports Sim's real entry points: docs serializeMarkdown and compileDocument, apps/sim's createMarkdownExport (assets passed as buffers), and a remark-stringify processor configured the same way as markdown-export.ts. I ran it on 2.1.2 and on 2.2.2 and diffed the outputs.

• Tricky corpus (26 cases: intraword _, * next to punctuation, emoji, autolinks/bare URLs, &/entities, code spans, tables, nested/task lists, inline and block HTML, footnotes, existing escapes):
  • Most changes drop unneeded \_ escapes.
  • Fenced-code info now escapes & (title="a\&b"); the parsed meta is unchanged.
  • Image titles may escape [ or a trailing _; the decoded alt/title is unchanged.
  • 2.1.2 had a real bug with apps/sim's unsafe config: the text \# not a heading serialized as # not a heading, which turns it into a heading. 2.2.2 keeps the escape, so that case now round-trips.
  • No new escapes appeared in visible text. No case that round-tripped before stopped round-tripping, and the docs serializer stays idempotent.
• All 507 docs pages through compileDocument: 213 pages changed, with 0 errors.
  • 3,690 of the 3,691 changed lines differ only by removed \_ escapes.
  • When re-parsed, 212 of the 213 changed pages give an mdast tree identical to the 2.1.2 output.
  • The remaining page has a GFM autolink inside a table cell. There 2.1.2 doubled the backslashes in the URL; 2.2.2 emits one, which is closer to the source.
• Performance: whole-corpus serialization takes about 1.55s on 2.1.2 and about 2.45s on 2.2.2. Scaling is linear in document size on both (1x/4x/16x). The cost is build-time only and cached.
• apps/sim lib/uploads/server/markdown-export.test.ts: 19/19 pass.
• bun install --frozen-lockfile is clean. The lockfile diff touches only this package; its two new transitive dependencies were already in the lockfile.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• No new warnings introduced

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