Addresses the round-1 review of #369:
F1 [CRITICAL] Restore prom-client. The prior commit removed it as a 'stray dep',
but metrics.registry.ts imports it unconditionally at startup (main.ts boot), so
a clean frozen install had no prom-client -> server tsc TS2307 + boot crash. It
was surviving only via hoisting from a warm store. Restored to apps/server
dependencies + regenerated the lock (prom-client/tdigest/bintrees return),
keeping the @docmost/prosemirror-markdown dep. Verified: clean frozen install ->
require.resolve('prom-client') ok, server tsc EXIT 0.
F2 [HIGH] Two quadratic ReDoS vectors in foreign-markdown.ts on untrusted import
(runs synchronously on the request thread, 30MB cap):
(a) pass-2 was O(lines x defs) — a per-def RegExp rebuilt and run over every
line. Replaced with ONE precompiled alternation regex over all def ids,
built once per document, with an id->body lookup in the replacer: O(text).
(b) the inline-code split alternation backtracks quadratically on a long
UNCLOSED backtick run. Lines over 8KB now skip the split (left untouched) —
a real footnote line is never that long.
F3 [WARNING] Restore the leading YAML front-matter strip that the retired
markdownToHtml layer did. Without it, Obsidian/Hugo/Jekyll/git-sync files leak
their front-matter into the body (and 'title:' renders as a setext heading that
title extraction can hijack).
F4 [WARNING] Extend the zip-import spec with an image (width+align) + callout
fidelity assertion through the PM->HTML->PM hop (the one hop the package suite
does not cover).
F5/F6 Update AGENTS.md (apps/server is now a prosemirror-markdown consumer) and
make the server pretest build prosemirror-markdown too.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder
e17d5bc060