[PLUGINS] Add plugin result normalization contract tests for all bundled parsers

[utksh1]

Problem

SecuScan needs a production-grade improvement in this area: Parser output consistency..

Scope

Create shared fixtures ensuring every parser returns normalized findings, severities, evidence, and metadata fields.

Acceptance Criteria

• The implementation is focused and does not introduce unrelated UI, docs, lockfile, or formatting churn.
• Security-sensitive behavior has explicit negative tests where applicable.
• Existing tests continue to pass, and new tests cover the main success and failure paths.
• Documentation or configuration examples are updated when operator behavior changes.

Verification

Tests should cover every bundled parser and reject unknown severity or malformed finding shapes.

Difficulty

Hard, useful issue intended for experienced contributors.

[VIDYANKSHINI]

Hi @utksh1,

I would love to work on this issue!

To ensure parser output consistency and meet the acceptance criteria, I plan to:

• Create centralized contract test fixtures that validate the normalized structure (findings, severities, evidence, and metadata) across all bundled parsers.
• Implement explicit negative tests to gracefully reject malformed shapes or unknown severities.
• Ensure the changes remain strictly focused on backend/plugin logic without introducing unrelated churn.

Could you please assign this issue to me? Thanks!

[vikas-6]

./assign me under gssoc 2026

[aaniya22]

Please assign this issue to me under Gssoc'26