fix: report audit error and pending statuses

[JohnsonLyu]

Closes #447

Summary

• Include ERROR and PENDING_LLM in audit text and JSON summaries
• Show ERROR and PENDING_LLM results in default CLI output
• Prevent duplicate status sections with --show-all
• Add regression tests for the reporting behavior

Type of Change

• Bug fix (non-breaking change fixing an issue)
• New feature (non-breaking change adding functionality)
• Breaking change (fix or feature causing existing functionality to change)
• Documentation update
• Refactoring (no functional changes)

Framework Changes Checklist

If this PR modifies the darnit framework (packages/darnit/):

• Updated framework spec (docs/architecture/framework-design.md) if behavior changed
• Ran uv run python scripts/validate_sync.py --verbose and it passes

Control/TOML Changes Checklist

If this PR modifies controls or TOML configuration:

• Control metadata defined in TOML (not Python code)
• SARIF fields (description, severity, help_url) included where appropriate
• Ran validation to confirm TOML schema compliance

Testing

• Tests pass locally (uv run pytest tests/ -v)
• Added tests for new functionality (if applicable)
• Linting passes (uv run ruff check .)

tests/darnit/test_cli.py: 28 passed. Relevant lint checks pass.

AI assistance

• No AI assistance was used
• AI assistance was used

Cursor was used to help inspect the issue, implement the reporting changes, and add tests.

Additional Notes