Plan 55 Phase 1. The sweep found zero vulnerabilities: every raw-HTML sink is
safe by construction (escape-first SQL/file highlighters, sanitizeSvgInner for
extension icons, the escape-then-allowlist markdown renderer) and the backend
has no |safe/Markup(/render_template_string.
To keep it that way: scripts/check-html-sinks.mjs (wired into npm run lint) and a
Python mirror test (test_html_sink_sweep.py, runs in the backend suite) fail on
any raw-HTML sink that neither references an allowlisted sanitizer nor carries a
'sink-safe:' annotation. Standardized annotations on the three variable-fed sinks
(markdown, SQL editor, marketplace icon) and documented the rule in SECURITY.md.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
