test(calibration): replace real-name holder fixture with charlie-example placeholder

Privacy iron rule: no real people's names in checked-in code. The sanctioned
placeholder mapping uses people/charlie-example.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/calibration-profile.test.ts

@@ -349,9 +349,9 @@ describe('runPhaseCalibrationProfile — phase integration', () => {
     const { engine } = buildMockEngine({
       scorecard: { total_bets: 0, resolved: 0, correct: 0, incorrect: 0, partial: 0,
         accuracy: null, brier: null, partial_rate: null, unresolvable_count: 0, unresolvable_rate: null },
-      userHolder: 'people/tyler-singletary',
+      userHolder: 'people/charlie-example',
     });
     const result = await runPhaseCalibrationProfile(buildCtx(engine), {});
-    expect(result.summary).toContain('holder=people/tyler-singletary');
+    expect(result.summary).toContain('holder=people/charlie-example');
   });
 });

test/owner-holder.test.ts

@@ -16,12 +16,12 @@ describe('owner-holder', () => {
   });
 
   test('uses config value when set and no override', () => {
-    expect(resolveOwnerHolder({ configValue: 'people/tyler-singletary' }))
-      .toBe('people/tyler-singletary');
+    expect(resolveOwnerHolder({ configValue: 'people/charlie-example' }))
+      .toBe('people/charlie-example');
   });
 
   test('override beats config and default', () => {
-    expect(resolveOwnerHolder({ override: 'world', configValue: 'people/tyler-singletary' }))
+    expect(resolveOwnerHolder({ override: 'world', configValue: 'people/charlie-example' }))
       .toBe('world');
   });
 });