Fix status checks: lint, format, typecheck, and tests (#8)

* Initial plan

* Initial assessment - identifying issues to fix

Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>

* Fix type check and test issues to pass all status checks

Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>

* Add coverage.xml to .gitignore and remove from tracking

Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>

* Use more specific pattern for coverage.xml in .gitignore

Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: arnavsacheti <36746504+arnavsacheti@users.noreply.github.com>

src/peakrdl_busdecoder/cpuif/apb3/apb3_cpuif.py

@@ -19,6 +19,7 @@ class APB3Cpuif(BaseCpuif):
 
         # Only add array dimensions if this should be treated as an array
         if self.check_is_array(child):
+            assert child.array_dimensions is not None
             return f"{base} {''.join(f'[{dim}]' for dim in child.array_dimensions)}"
 
         return base

src/peakrdl_busdecoder/cpuif/apb4/apb4_cpuif.py

@@ -19,6 +19,7 @@ class APB4Cpuif(BaseCpuif):
 
         # Only add array dimensions if this should be treated as an array
         if self.check_is_array(child):
+            assert child.array_dimensions is not None
             return f"{base} {''.join(f'[{dim}]' for dim in child.array_dimensions)}"
 
         return base

src/peakrdl_busdecoder/cpuif/axi4lite/axi4_lite_cpuif.py

@@ -19,6 +19,7 @@ class AXI4LiteCpuif(BaseCpuif):
 
         # Only add array dimensions if this should be treated as an array
         if self.check_is_array(child):
+            assert child.array_dimensions is not None
             return f"{base} {''.join(f'[{dim}]' for dim in child.array_dimensions)}"
 
         return base

src/peakrdl_busdecoder/cpuif/axi4lite/axi4_lite_cpuif_flat.py

@@ -19,6 +19,7 @@ class AXI4LiteCpuifFlat(BaseCpuif):
 
         # Only add array dimensions if this should be treated as an array
         if self.check_is_array(child):
+            assert child.array_dimensions is not None
             return f"{base} {''.join(f'[{dim}]' for dim in child.array_dimensions)}"
 
         return base