fix: sync error code docs links

tests/unit/utils/error-codes.test.ts

@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'bun:test';
+import { ERROR_CODES, getErrorCategory, getErrorDocUrl } from '../../../src/utils/error-codes';
+
+describe('error-codes', () => {
+  it('builds live docs URLs with lowercase anchors', () => {
+    expect(getErrorDocUrl(ERROR_CODES.PROFILE_NOT_FOUND)).toBe(
+      'https://docs.ccs.kaitran.ca/reference/error-codes#e104'
+    );
+    expect(getErrorDocUrl(ERROR_CODES.INTERNAL_ERROR)).toBe(
+      'https://docs.ccs.kaitran.ca/reference/error-codes#e900'
+    );
+  });
+
+  it('maps numeric ranges to human-readable categories', () => {
+    expect(getErrorCategory(ERROR_CODES.CONFIG_MISSING)).toBe('Configuration');
+    expect(getErrorCategory(ERROR_CODES.PROFILE_NOT_FOUND)).toBe('Profile Management');
+    expect(getErrorCategory(ERROR_CODES.CLAUDE_NOT_FOUND)).toBe('Claude CLI Detection');
+    expect(getErrorCategory(ERROR_CODES.API_AUTH_FAILED)).toBe('Network/API');
+    expect(getErrorCategory(ERROR_CODES.FS_CANNOT_READ_FILE)).toBe('File System');
+    expect(getErrorCategory(ERROR_CODES.INVALID_STATE)).toBe('Internal');
+  });
+});