[pull] main from pylint-dev:main

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.1)

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Summary by Sourcery

Standardize and centralize Unknown node instantiation by introducing a shared UNATTACHED_UNKNOWN, updating constructor and context propagation, replacing scattered Unknown() usages across objectmodel and protocols, tightening NodeNG.root(), and adapting tests with a new xfail regression case.

Enhancements:

• Introduce a global UNATTACHED_UNKNOWN singleton with SYNTHETIC_ROOT parent to standardize Unknown nodes
• Require parent parameter in Unknown constructor and propagate instance context when creating Unknown in objectmodel
• Replace ad-hoc Unknown() instances with UNATTACHED_UNKNOWN in inference protocols and tests
• Tighten NodeNG.root() to only return Module and remove Unknown assertion

Tests:

• Update tests to use UNATTACHED_UNKNOWN and adjust as_string and inference assertions
• Add xfail regression test for eval.__get__(1) should be an inference error pylint-dev/astroid#2743 ensuring eval.get inference raises InferenceError

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Reviewer's Guide

This PR centralizes handling of unknown AST nodes by introducing a shared UNATTACHED_UNKNOWN instance, enforcing explicit parent propagation for Unknown nodes, updating code and tests to use this new constant or supply a parent, refining interpreter objectmodel methods to instantiate Unknown with the correct context, tightening node root typing, and adding a new xfail regression test for eval.get inference.

File-Level Changes

Change	Details	Files
Refactor Unknown node instantiation and usage	Require parent parameter in Unknown constructor and remove default parent argument Introduce UNATTACHED_UNKNOWN=Unknown(parent=SYNTHETIC_ROOT) Replace ad-hoc Unknown() calls with UNATTACHED_UNKNOWN or pass parent where needed Update tests to use SYNTHETIC_ROOT parent for Unknown instances	tests/test_nodes.py tests/test_regrtest.py astroid/nodes/node_classes.py astroid/protocols.py tests/test_helpers.py
Propagate correct parent in interpreter Unknown returns	Modify attr___spec__, attr___loader__, attr___cached__, attr___ne__, attr___annotations__ to pass self._instance as Unknown parent	astroid/interpreter/objectmodel.py
Tighten node_ng root method typing	Change root() return type annotation to nodes.Module only Adjust assertion to reflect only Module instances	astroid/nodes/node_ng.py
Add xfail regression test for eval.get inference error	Introduce new test_regression_eval_get_of_arg marked xfail raising InferenceError	tests/test_regrtest.py

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