Please address the comments from this code review:

## Overall Comments
- The new `setCvssData` logic relies solely on `base_score`; if Trustify ever omits this field for some entries, consider a fallback to per-advisory/purl_status scoring data to avoid silently producing issues without CVSS information.
- The remediation construction in `setCvssData` (version range + remediations) has become quite dense; consider extracting this into helper methods to make the transformation from v3 JSON to `Remediation` and `VersionRange` easier to follow and maintain.
- Changing `DEFAULT_SOURCE` from "manual" to "unknown" and deriving source from `issuer.name` instead of the previous importer may affect how issues are grouped by source; if this is intentional, it may be worth centralizing the mapping logic in a dedicated helper to keep future adjustments localized.

## Individual Comments

### Comment 1
<location path="src/test/java/io/github/guacsec/trustifyda/integration/providers/trustify/TrustifyResponseHandlerTest.java" line_range="472" />
<code_context>
     Issue issue = issues.get(0);

-    // Should prioritize V4 based on SCORE_TYPE_ORDER
+    // v3 provides pre-computed base_score
     assertEquals(7.2f, issue.getCvssScore());
     assertEquals(Severity.HIGH, issue.getSeverity());
</code_context>
<issue_to_address>
**suggestion (testing):** Consider adding a test where base_score has a score but no severity to verify score-based severity fallback

The updated `setCvssData` falls back to `SeverityUtils.fromScore` when `base_score.severity` is missing or unparsable, but there’s no test for a `base_score` that has only a numeric score and no severity field. Please add a test (e.g., a variant of `testResponseToIssuesWithMultipleScoreTypes`) using such input to verify that severity is correctly derived from the score when Trustify omits `severity`.

Suggested implementation:

```java
    List<Issue> issues = packageItem.issues();
    Issue issue = issues.get(0);

    // v3 provides pre-computed base_score
    assertEquals(7.2f, issue.getCvssScore());
    assertEquals(Severity.HIGH, issue.getSeverity());
  }

  @Test
  void testBaseScoreSeverityFallbackWhenSeverityMissing() throws Exception {
    String response = """
    {
      "vulnerabilities": [{
        "identifier": "CVE-2024-1597",
        "title": "Test CVE",
        "scores": {
          "cvss_v3": {
            "version": "3.1",
            "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "base_score": {
              "score": 7.2
            }
          }
        }
      }],
      "packages": [{
        "purl": "pkg:maven/org.example/foo@1.0.0",
        "issues": [{
          "identifier": "CVE-2024-1597"
        }]
      }],
      "warnings": []
    }
    """;

    // Adapt this setup to however the existing tests obtain a PackageItem
    PackageItem packageItem = trustifyResponseHandler.handleResponse(response);

    List<Issue> issuesWithScoreOnly = packageItem.issues();
    Issue issueWithScoreOnly = issuesWithScoreOnly.get(0);

    // base_score has only a numeric score and no severity; severity should be derived from the score
    assertEquals(7.2f, issueWithScoreOnly.getCvssScore());
    assertEquals(Severity.HIGH, issueWithScoreOnly.getSeverity());
  }
        {
          "identifier": "CVE-2024-1597",

```

The new test assumes there is a `trustifyResponseHandler.handleResponse(String)` (or similar) method that returns a `PackageItem`, consistent with how `packageItem` is created in the existing tests. To integrate this test correctly, you should:

1. Replace `trustifyResponseHandler.handleResponse(response)` with the exact helper or setup logic used in the other tests in this class to obtain `packageItem` from the JSON response.
2. Ensure the JSON structure (particularly the `packages` and `issues` linkage) matches what the existing tests expect. If the existing tests use a slightly different envelope (e.g., different top-level keys or nesting), adjust the JSON in the new test to mirror that structure while keeping `base_score` with only a `score` field and no `severity`.
3. If the class uses a different naming convention for the handler or `PackageItem`, adjust the types and variable names accordingly.
</issue_to_address>

### Comment 2
<location path="src/test/java/io/github/guacsec/trustifyda/integration/providers/trustify/TrustifyResponseHandlerTest.java" line_range="699" />
<code_context>

     Issue issue = issues.get(0);
-    assertEquals("manual", issue.getSource());
+    assertEquals("unknown", issue.getSource());
   }

</code_context>
<issue_to_address>
**suggestion (testing):** Consider a dedicated test for purl_status entries without an advisory to exercise getSource’s DEFAULT_SOURCE path explicitly

Since `getSource` now derives the source from `advisory.issuer.name` with a fallback to "unknown", this test only covers the `issuer == null` case when an advisory is present. Please also add a test where `purl_status` has no `advisory` at all to cover the `advisory == null` branch and verify it still returns "unknown" without throwing.

Suggested implementation:

```java
import io.github.guacsec.trustifyda.api.PackageRef;
import io.github.guacsec.trustifyda.api.v5.Issue;
import io.github.guacsec.trustifyda.api.v5.RemediationCategory;
import io.github.guacsec.trustifyda.api.v5.Severity;
import io.github.guacsec.trustifyda.integration.Constants;
import io.github.guacsec.trustifyda.integration.providers.trustify.ubi.UBIRecommendation;

  @Test
  void testIssueSourceIsUnknownWhenAdvisoryIsMissing() {
    // Response containing a purl_status entry without an advisory block to
    // exercise the getSource DEFAULT_SOURCE ("unknown") path.
    String responseWithoutAdvisory = """
{
  "purl_status": [
    {
      "purl": "pkg:maven/org.example/foo@1.0.0",
      "status": "vulnerable"
    }
  ]
}
""";

    List<Issue> issues = TrustifyResponseHandler.responseToIssues(responseWithoutAdvisory);

    assertEquals(1, issues.size());

    Issue issue = issues.get(0);
    assertEquals("unknown", issue.getSource());
  }

  private static Stream<String> testResponseToIssuesWithValidData() {
    return Stream.of(

```

Depending on the existing code in `TrustifyResponseHandlerTest` and `TrustifyResponseHandler`, you may need to:

1. Ensure the following imports are present at the top of the file (if they are not already):
   - `import java.util.List;`
   - `import org.junit.jupiter.api.Test;`
2. Adjust the call `TrustifyResponseHandler.responseToIssues(responseWithoutAdvisory);` if your handler uses a different factory/utility method or signature (for example `fromResponse`, `toIssues`, or an instance method).
3. If your Trustify JSON structure requires additional mandatory fields beyond `purl` and `status`, extend the `responseWithoutAdvisory` JSON fixture accordingly while keeping the `advisory` field absent for this test case.
</issue_to_address>