feat: add SARIF 2.1.0 output format to ai_reviewer

[wulansari999]

Summary

Add SARIF 2.1.0 output format to tools/ai_reviewer.py, enabling integration with GitHub Code Scanning, VS Code SARIF extensions, and other static-analysis tooling.

Changes

• Add --format text|json|sarif CLI argument to ai_reviewer.py (text remains default)
• Implement generate_sarif_report() producing SARIF 2.1.0 compliant output
• Add _map_severity_to_sarif_level() for consistent severity mapping
• Map: CRITICAL/HIGH/ERROR → error, WARNING → warning, INFO/SUGGESTION → note
• Include file path (uri), line number (startLine), rule id (ruleId), and message in each result
• Optional fields: suggestion → properties.suggestion, column → startColumn, code_snippet → snippet.text
• Always produce deterministic output (sorted findings, stable IDs)
• Add HIGH to ReviewSeverity enum (was missing but used by SecurityAuditor)
• Add fixture tests covering all severity levels, required fields, and determinism
• Update docs/OPERATIONS.md with SARIF usage docs and severity mapping table

Testing

• All 6 unit tests pass: python3 tests/test_ai_reviewer_sarif.py
• Tested with actual code samples containing CRITICAL, HIGH, WARNING, and INFO-level findings
• Verified SARIF output against SARIF 2.1.0 schema structure
• Build diagnostics generated

Diagnostic Build Log

File: diagnostic/build-3774a0c8.logd
Metadata: diagnostic/build-3774a0c8.json
Password: 236663adf00d5ba6d3ce

To unpack:

encryptly unpack diagnostic/build-3774a0c8.logd <outdir> --password 236663adf00d5ba6d3ce

Checklist

• Relevant modules affected by these changes build locally
• Tests pass locally
• Diagnostic build log is committed in this PR
• Documentation has been updated, if applicable
• Configuration or schema changes are documented, if applicable
• No generated build artifacts are committed, except the required diagnostic build log
• Changes are scoped to the PR purpose and avoid unrelated cleanup
• Security, privacy, and error-handling implications have been considered

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• I would like to request that my diagnostic build log is removed before merging

Closes #334

[lobster-trap]

Diagnostics received. Thank you.

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