feat(advisor): Evidence Workspace — structured panes, markdown, sources as knowledge units

Rebuilds the Compliance Advisor floating widget from a plain chat into an Evidence
Workspace: pinned last question, markdown-rendered answer (clean prose), and separate
panes for Sources (hierarchical Knowledge Units), Figures (C8, conditional) and
Footnotes (C-FN), plus a stats bar (Quellen/Regelwerke/Diagramme/Fußnoten). Scrollable
turn history; stays a floating icon on every SDK page.

Architecture (user direction): the frontend renders ONLY structured evidence and NEVER
parses the answer text. The proxy now returns a JSON AdvisorEvidenceMeta line followed
by the streamed markdown answer; advisor-rag exposes structured results; an adapter maps
RAG/compiler output to the frontend envelope. Figures/footnotes wire in once the
RAG-ingestion contract lands (requested on the board) — figures pane is conditional.

- lib/sdk/advisor/{evidence,evidence-adapter}.ts (+ adapter test, 7 cases)
- components/sdk/advisor/* panes + in-house safe Markdown (no new dep, no dangerouslySetInnerHTML) + test
- useAdvisorStream (meta-line parse + streamed answer) + useAdvisorEmail (escaped)
- proxy: evidence-meta-v1 envelope + clean-prose prompt (no inline citations)
- tsc clean, 11 vitest pass, check-loc 0. ESLint not installed in this node_modules -> CI lints on push.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

admin-compliance/components/sdk/advisor/SourcesPane.tsx

@@ -0,0 +1,24 @@
+'use client'
+
+import { Library } from 'lucide-react'
+import type { KnowledgeUnit } from '@/lib/sdk/advisor/evidence'
+import { KnowledgeUnitCard } from './KnowledgeUnitCard'
+import { PaneHeader } from './PaneHeader'
+
+/** Sources pane — the answer's evidence as hierarchical Knowledge Units, separate from the prose. */
+export function SourcesPane({ sources }: { sources: KnowledgeUnit[] }) {
+  return (
+    <section>
+      <PaneHeader icon={<Library className="h-3.5 w-3.5 text-gray-500" />} title="Quellen" count={sources.length} />
+      {sources.length === 0 ? (
+        <p className="px-1 text-[11px] text-gray-400">Keine strukturierten Quellen zu dieser Antwort.</p>
+      ) : (
+        <div className="space-y-1.5">
+          {sources.map((s) => (
+            <KnowledgeUnitCard key={s.id} unit={s} />
+          ))}
+        </div>
+      )}
+    </section>
+  )
+}