KB/process content was shown via a bare unsanitized ReactMarkdown in the
ops view dialog (the /ops/[id] route is the editor, not a view). Route
it through the shared SafeMarkdown instead. New dependency-free
lib/markdown-anchors.ts (heading-text flatten, GitHub-ish slug,
per-render dedupe, in-doc href test; unit-tested) is wired into both
SafeMarkdown and MarkdownBody so headings get stable ids and a
[link](#heading) resolves. In-document links no longer force a new tab,
which previously broke the anchor jump for policies/proposals too.
rehype-slug was not added (no offline install); the helper is equivalent
and tested.
