chore: further cleanup, removed duplicate files, tests for get_alert_investigation_report, missing camelCase for AI Investigation report output

[samuelmatos-s1]

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[github-actions]

AI Analysis

Here are some suggestions to consider:

• No blocking issues spotted; the new investigation-report tests (tests/unit/tools/test_alerts_investigation_report.py:1) together with the client coverage (tests/unit/libs/alerts/test_client.py:757) exercise success/null/error paths, AIInvestigation now emits camelCase JSON (src/purple_mcp/libs/alerts/models.py:609), and the standalone fields-validation tests (tests/unit/tools/test_fields_validation.py:1) thoroughly cover the helper, so this branch is already well exercised.

These suggestions are generated by gpt-5.1-codex-mini as an experimental capability. It may make mistakes. You do not need to follow all these suggestions.