Extract dashboard redaction helpers

Centralize dashboard secret redaction helpers and add focused regression tests.

apps/dashboard/src/redaction.test.ts

@@ -0,0 +1,26 @@
+import { describe, expect, it } from 'vitest';
+
+import { redactSecretsForMarkdown, redactSecretsForPreview } from './redaction';
+
+describe('dashboard redaction', () => {
+  it('redacts named secret assignments for markdown output', () => {
+    expect(redactSecretsForMarkdown('OPENAI_API_KEY=sk-testvalue1234')).toBe(
+      'OPENAI_API_KEY=***',
+    );
+  });
+
+  it('redacts named secret assignments for compact previews', () => {
+    expect(redactSecretsForPreview('BOT_TOKEN=xoxb-testvalue1234')).toBe(
+      'BOT_TOKEN=<redacted>',
+    );
+  });
+
+  it('redacts standalone secret values consistently', () => {
+    const raw = 'token sk-1234567890abcdef and ghp_1234567890abcdef';
+
+    expect(redactSecretsForMarkdown(raw)).toBe('token *** and ***');
+    expect(redactSecretsForPreview(raw)).toBe(
+      'token <redacted-token> and <redacted-token>',
+    );
+  });
+});