feat(renown): add the Renown power-curve table and reputation-rank resolver

apps/api/src/reputation/reputation-rank.spec.ts

@@ -0,0 +1,33 @@
+import { resolveReputationRank } from './reputation-rank';
+
+describe('resolveReputationRank', () => {
+  it('resolves 0 reputation to Stranger with a next threshold of 100', () => {
+    expect(resolveReputationRank(0)).toEqual({
+      key: 'STRANGER',
+      label: 'Fremder',
+      threshold: 0,
+      nextThreshold: 100,
+    });
+  });
+
+  it('resolves exactly at a threshold to that rank, not the one below', () => {
+    expect(resolveReputationRank(100).key).toBe('TOLERATED');
+    expect(resolveReputationRank(99).key).toBe('STRANGER');
+  });
+
+  it('resolves every documented threshold to its exact rank', () => {
+    expect(resolveReputationRank(250).key).toBe('KNOWN');
+    expect(resolveReputationRank(500).key).toBe('RECOGNIZED');
+    expect(resolveReputationRank(800).key).toBe('TRUSTED');
+    expect(resolveReputationRank(1200).key).toBe('ESTEEMED');
+  });
+
+  it('has no next threshold once at the top rank', () => {
+    expect(resolveReputationRank(1200).nextThreshold).toBeNull();
+    expect(resolveReputationRank(50_000).nextThreshold).toBeNull();
+  });
+
+  it('reports the correct nextThreshold mid-range', () => {
+    expect(resolveReputationRank(300).nextThreshold).toBe(500);
+  });
+});

apps/api/src/reputation/reputation-rank.ts

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+export interface ReputationRankInfo {
+  key: string;
+  label: string;
+  threshold: number;
+  nextThreshold: number | null;
+}
+
+// Verbatim thresholds from spec §10, German labels for the German-language UI.
+// Sorted descending: the first entry whose threshold <= reputation wins.
+const REPUTATION_RANKS: ReadonlyArray<{ threshold: number; key: string; label: string }> = [
+  { threshold: 1200, key: 'ESTEEMED', label: 'Geachtet' },
+  { threshold: 800, key: 'TRUSTED', label: 'Vertraut' },
+  { threshold: 500, key: 'RECOGNIZED', label: 'Anerkannt' },
+  { threshold: 250, key: 'KNOWN', label: 'Bekannt' },
+  { threshold: 100, key: 'TOLERATED', label: 'Geduldet' },
+  { threshold: 0, key: 'STRANGER', label: 'Fremder' },
+];
+
+export function resolveReputationRank(reputation: number): ReputationRankInfo {
+  const index = REPUTATION_RANKS.findIndex((rank) => reputation >= rank.threshold);
+  const rank = REPUTATION_RANKS[index];
+  const nextRank = index > 0 ? REPUTATION_RANKS[index - 1] : null;
+
+  return {
+    key: rank.key,
+    label: rank.label,
+    threshold: rank.threshold,
+    nextThreshold: nextRank ? nextRank.threshold : null,
+  };
+}