fix: remove unused assignment and import warnings in tests

docs/arch/ascii/project.txt

@@ -0,0 +1,54 @@
+╔══════════════════════════════════════╗
+║         Architecture Overview        ║
+╠══════════════════════════════════════╣
+║  Elements: 14     Modules: 1       ║
+║  Relationships: 25                  ║
+╚══════════════════════════════════════╝
+
+┌─ (ungrouped)
+│  [prj] archlens-domain
+│  [prj] archlens-application
+│  [prj] archlens
+└───
+
+┌─ Adapters (11 types)
+│
+│  ├── [prj] archlens-tree-sitter
+│  ├── [prj] archlens-walkdir
+│  ├── [prj] archlens-mermaid
+│  ├── [prj] archlens-ascii
+│  ├── [prj] archlens-file-writer
+│  ├── [prj] archlens-stdout-writer
+│  ├── [prj] archlens-toml-config
+│  ├── [prj] archlens-cargo-workspace
+│  ├── [prj] archlens-python-project
+│  ├── [prj] archlens-d2
+│  └── [prj] archlens-html
+└───
+
+── Relationships ──
+  archlens-application ─[has]─> archlens-domain
+  archlens ─[has]─> archlens-tree-sitter
+  archlens ─[has]─> archlens-ascii
+  archlens ─[has]─> archlens-stdout-writer
+  archlens ─[has]─> archlens-application
+  archlens ─[has]─> archlens-walkdir
+  archlens ─[has]─> archlens-d2
+  archlens ─[has]─> archlens-html
+  archlens ─[has]─> archlens-mermaid
+  archlens ─[has]─> archlens-file-writer
+  archlens ─[has]─> archlens-domain
+  archlens ─[has]─> archlens-cargo-workspace
+  archlens ─[has]─> archlens-toml-config
+  archlens ─[has]─> archlens-python-project
+  archlens-tree-sitter ─[has]─> archlens-domain
+  archlens-walkdir ─[has]─> archlens-domain
+  archlens-mermaid ─[has]─> archlens-domain
+  archlens-ascii ─[has]─> archlens-domain
+  archlens-file-writer ─[has]─> archlens-domain
+  archlens-stdout-writer ─[has]─> archlens-domain
+  archlens-toml-config ─[has]─> archlens-domain
+  archlens-cargo-workspace ─[has]─> archlens-domain
+  archlens-python-project ─[has]─> archlens-domain
+  archlens-d2 ─[has]─> archlens-domain
+  archlens-html ─[has]─> archlens-domain