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/FootnotesPane.tsx

@@ -0,0 +1,28 @@
+'use client'
+
+import { Hash } from 'lucide-react'
+import type { FootnoteUnit } from '@/lib/sdk/advisor/evidence'
+import { PaneHeader } from './PaneHeader'
+
+/** Footnotes pane (C-FN) — rendered only when present. */
+export function FootnotesPane({ footnotes }: { footnotes: FootnoteUnit[] }) {
+  if (footnotes.length === 0) return null
+  return (
+    <section>
+      <PaneHeader icon={<Hash className="h-3.5 w-3.5 text-gray-500" />} title="Fußnoten" count={footnotes.length} />
+      <div className="space-y-1">
+        {footnotes.map((fn) => (
+          <div key={fn.id} className="rounded-md border border-gray-200 bg-white p-2 text-[11px]">
+            <span className="font-semibold text-gray-900">{fn.ref}</span>
+            <span className="text-gray-400">
+              {' · '}
+              {fn.source.short}
+              {fn.section ? ` / ${fn.section}` : ''}
+            </span>
+            {fn.text && <p className="mt-0.5 text-gray-600">{fn.text}</p>}
+          </div>
+        ))}
+      </div>
+    </section>
+  )
+}