fix: correct PageRank init, dangling-node handling, and convergence (… - #14894

web_programming/crawl_google_scholar_citation.py:26:15: unresolved-attribute: Attribute `find_all` is not defined on `None` in union `Tag | None`

web_programming/crawl_google_results.py:36:29: invalid-argument-type: Argument to function `open` is incorrect: Expected `str`, found `str | AttributeValueList | None` info: element `AttributeValueList` of union `str | AttributeValueList | None` is not assignable to `str` stdlib/webbrowser.pyi:21:5: info: Function defined here stdlib/webbrowser.pyi:21:10: Parameter declared here

web_programming/crawl_google_results.py:28:21: unresolved-attribute: Object of type `Response` has no attribute `iter_content`

scripts/validate_solutions.py:34:5: unresolved-attribute: Attribute `loader` is not defined on `None` in union `ModuleSpec | None`

scripts/validate_solutions.py:34:5: unresolved-attribute: Attribute `exec_module` is not defined on `None` in union `Loader | None`

scripts/validate_solutions.py:33:46: invalid-argument-type: Argument to function `module_from_spec` is incorrect: Expected `ModuleSpec`, found `ModuleSpec | None` info: element `None` of union `ModuleSpec | None` is not assignable to `ModuleSpec` stdlib/_frozen_importlib.pyi:45:5: info: Function defined here stdlib/_frozen_importlib.pyi:45:22: Parameter declared here

scripts/validate_solutions.py:19:8: unresolved-import: Cannot resolve imported module `pytest` info: Searched in the following paths during module resolution: info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty) info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib/python3.14/site-packages (site-packages) info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib64/python3.14/site-packages (site-packages) info: 4. /home/runner/work/Python/Python/.venv/lib/python3.14/site-packages (site-packages) info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.14/site-packages (site-packages) info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment

maths/trailing_zeroes.py:33:9: invalid-assignment: Object of type `float` is not assignable to `int` maths/trailing_zeroes.py:6:26: Declared type

maths/test_factorial.py:10:6: unresolved-import: Cannot resolve imported module `maths.factorial` info: Searched in the following paths during module resolution: info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty) info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib/python3.14/site-packages (site-packages) info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib64/python3.14/site-packages (site-packages) info: 4. /home/runner/work/Python/Python/.venv/lib/python3.14/site-packages (site-packages) info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.14/site-packages (site-packages) info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment

maths/test_factorial.py:8:8: unresolved-import: Cannot resolve imported module `pytest` info: Searched in the following paths during module resolution: info: 1. vendored://stdlib (stdlib typeshed stubs vendored by ty) info: 2. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib/python3.14/site-packages (site-packages) info: 3. /home/runner/work/_temp/setup-uv-cache/builds-v0/.tmpeDbXRQ/lib64/python3.14/site-packages (site-packages) info: 4. /home/runner/work/Python/Python/.venv/lib/python3.14/site-packages (site-packages) info: 5. /home/runner/work/Python/Python/.venv/lib64/python3.14/site-packages (site-packages) info: make sure your Python environment is properly configured: https://docs.astral.sh/ty/modules/#python-environment

web_programming/current_weather.py:33:8: redundant-condition: Object of type `Literal[""]` is always falsy

web_programming/current_weather.py:27:8: redundant-condition: Object of type `Literal[""]` is always falsy

matrix/matrix_operation.py:44:13: redundant-condition: Expression `_verify_matrix_sizes(matrix_a, matrix_b)` is always truthy (has type `tuple[tuple[int, int], tuple[int, int]]`)