Refactor test cases for improved readability and consistency

- Updated test_dns.py to enhance mock function definitions and improve spacing for better readability.
- Modified test_filters.py to streamline assertions and ensure consistent formatting across test cases.
- Cleaned up test_import_export.py by organizing imports and ensuring consistent formatting in CSV and JSON tests.
- Improved test_main.py by refining mock setups and ensuring consistent error handling in assertions.

docs/agents/triage-labels.md

@@ -0,0 +1,15 @@
+# Triage Labels
+
+The skills speak in terms of five canonical triage roles. This file maps those
+roles to the label strings used in this repository's Forgejo issue tracker.
+
+| Label in mattpocock/skills | Label in our tracker | Meaning                                   |
+| -------------------------- | -------------------- | ----------------------------------------- |
+| `needs-triage`             | `needs-triage`       | Maintainer needs to evaluate this issue   |
+| `needs-info`               | `needs-info`         | Waiting on reporter for more information |
+| `ready-for-agent`          | `ready-for-agent`    | Fully specified, ready for an AFK agent   |
+| `ready-for-human`          | `ready-for-human`    | Requires human implementation             |
+| `wontfix`                  | `wontfix`            | Will not be actioned                      |
+
+When a skill mentions a canonical role, use the corresponding tracker label
+from this table.