Fix all ty diagnostics on ifcviewer-wgpu (ci-lint ty-ios + ty-bonsai)

This branch carried v0.8.0's strict `[tool.ty.rules] all = "error"` config but
not the source fixes that were made upstream to satisfy it, so both ci-lint ty
gates were failing: `poe ty-ios` reported 256 diagnostics and `poe ty-bonsai`
258. Both are now clean.

Most fixes are ported from v0.8.0 and follow two idioms: initialise a name
before a conditional that may not bind it (plus an `assert` where the invariant
is real but not provable), and close an exhaustive `if`/`elif` chain with
`else: assert False, <discriminant>`.

The branch's own newer accessors are preserved throughout - `.file`,
`.declaration`, `file.types()`, `get_max_id()` are kept rather than reverted to
`wrapped_data.*`, and non-ty upstream changes (notably the in-progress geometry
cache removal) are deliberately not pulled in.

Notable fixes that are not straight ports:

* ifcopenshell_wrapper.pyi: `entity_instance.file` was declared as
  `def file(self) -> file`, where the property name shadows the `class file`
  below it, so the annotation resolved to `Unknown`. Every `element.file` in
  the codebase was therefore unchecked. Qualifying it to `ifcopenshell.file`
  restores `.schema` to its Literal union and surfaces no new diagnostics.

* model/wall.py: a duplicated merge fragment in the void-straddle path ran an
  always-true `if void_straddles:` that read `new_opening` from the mutually
  exclusive branch (stale value, or NameError on the first iteration), followed
  by an unreachable duplicate `elif`. Removing it makes the file match v0.8.0.

* light/operator.py: upstream's own fix unpacks three targets from two values
  and raises ValueError unconditionally; corrected to `None, None, None`.

* assign_system.py, validate.py, geom/main.py: walrus-in-genexp is valid at
  runtime (PEP 572 binds in the containing scope) but ty does not model it;
  rewritten as explicit loops, matching upstream.

Verified: poe ty-ios, poe ty-bonsai, ruff check src/ nix/, black --check .,
and compileall -W error at py3.10 (ifcopenshell-python) and py3.11 (bonsai).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/ifcpatch/ifcpatch/__init__.py

@@ -184,7 +184,7 @@ class PatcherDoc(TypedDict):
 class InputDoc(TypedDict):
     name: str
     description: str
-    type: Union[str, list[str]]
+    type: NotRequired[Union[str, list[str]]]
     default: NotRequired[Any]
     generic_type: NotRequired[str]
     enum_items: NotRequired[list[str]]
@@ -201,7 +201,7 @@ def _extract_docs(cls: type, method_name: str, boilerplate_args: Union[Sequence[
     for name, parameter in signature.parameters.items():
         if name == "self" or name in boilerplate_args:
             continue
-        input_doc: InputDoc = {"name": name}
+        input_doc: InputDoc = {"name": name, "description": "Undocumented"}
         inputs[name] = input_doc
         if isinstance(parameter.default, (str, float, int, bool)):
             input_doc["default"] = parameter.default
@@ -267,10 +267,6 @@ def _extract_docs(cls: type, method_name: str, boilerplate_args: Union[Sequence[
             assert is_valid_filter_glob(filter_glob), f"Invalid filter_glob pattern: '{filter_glob}'."
             inputs[param_name]["filter_glob"] = filter_glob
 
-    for param_name in inputs:
-        if "description" not in inputs[param_name]:
-            inputs[param_name]["description"] = "Undocumented"
-
     docs = PatcherDoc(
         class_=cls,
         description=doc_description,
@@ -309,6 +305,7 @@ def parse_docstring(docstring: str) -> DocstringData:
             line = line[1:]
             if line.startswith(PREFIXES):
                 prefix = line.split(" ")[0]
+                assert prefix in PREFIXES, f"Invalid line: '{line}'."
                 current_section = prefix
                 match_ = re.match(rf"{prefix}\s+(\w+):\s+(.*)", line)
                 assert match_, f"Invalid line: '{line}'."

src/ifcpatch/ifcpatch/recipes/AssignConstituentFractions.py

@@ -71,6 +71,7 @@ class Patcher:
 
             # Sort elements by GlobalId to ensure consistent order
             elements_sorted = sorted(elements, key=lambda x: x.GlobalId)
+            element_quantities = None
             for element in elements_sorted:
                 quantities = self.get_element_quantities(element)
                 if quantities:

src/ifcpatch/ifcpatch/recipes/Ifc2Sql.py

@@ -521,7 +521,7 @@ class Patcher(ifcpatch.BasePatcher):
                 data_type = "JSON"
                 json_attrs.append(i)
             else:
-                print("Possibly not implemented attribute data type:", attribute, primitive)
+                assert False, f"{attribute}, {primitive}"
             if not self.is_strict or derived[i]:
                 optional = "DEFAULT NULL"
             else: