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/issue-tracker.md

@@ -0,0 +1,52 @@
+# Issue tracker: Forgejo
+
+Issues and PRDs for this repository live as Forgejo issues in
+`git.s1q.dev/phg/hosts`. Use `fgj` for all operations.
+
+Every repository-scoped command must use the hostname `git.s1q.dev` and
+repository `phg/hosts`.
+
+## Conventions
+
+- **Create an issue**:
+  `fgj --hostname git.s1q.dev issue create -R phg/hosts --title "..." --body "..."`
+- **Read an issue**:
+  `fgj --hostname git.s1q.dev issue view <number> -R phg/hosts`
+- **Read an issue as JSON**:
+  `fgj --hostname git.s1q.dev issue view <number> -R phg/hosts --json`
+- **List issues**:
+  `fgj --hostname git.s1q.dev issue list -R phg/hosts --state open --json`
+- **Comment on an issue**:
+  `fgj --hostname git.s1q.dev issue comment <number> -R phg/hosts --body "..."`
+- **Apply or remove labels**:
+  `fgj --hostname git.s1q.dev issue edit <number> -R phg/hosts --add-label "..."`
+  or `--remove-label "..."`
+- **Close an issue**:
+  `fgj --hostname git.s1q.dev issue close <number> -R phg/hosts --comment "..."`
+- **List repository labels**:
+  `fgj --hostname git.s1q.dev label list -R phg/hosts --json`
+
+## When a skill says "publish to the issue tracker"
+
+Create a Forgejo issue with `fgj issue create`.
+
+## When a skill says "fetch the relevant ticket"
+
+Run `fgj issue view <number>` with the configured hostname and repository.
+
+## Wayfinding operations
+
+The map is a Forgejo issue with one child issue per ticket.
+
+- **Map**: an issue labelled `wayfinder:map` containing Notes,
+  Decisions-so-far, and Fog sections.
+- **Child ticket**: an issue whose body starts with `Part of #<map>` and whose
+  type is recorded with a `wayfinder:<type>` label (`research`, `prototype`,
+  `grilling`, or `task`).
+- **Blocking**: put `Blocked by: #<number>, #<number>` at the top of the child
+  issue body. A ticket is unblocked when every listed issue is closed.
+- **Frontier**: inspect the map's open child issues and choose the first issue
+  that has no open blocker and has not been claimed.
+- **Claim**: apply the `wayfinder:claimed` label before beginning work.
+- **Resolve**: comment with the answer, close the child issue, then append a
+  context pointer to the map's Decisions-so-far section.