Hoist conditional call results into locals to reduce repeated evaluations

[pixge]

Motivation

• Reduce repeated function or attribute call evaluations inside if conditions to lower overhead in low-BPS hotspots.
• Make intent explicit by assigning condition results to local variables and reuse them in subsequent checks.
• Keep existing logic and behavior unchanged while improving readability.

Description

• Cache filename.endswith(".py") into is_python_file in directory/scanner.py and file/path_collector.py to avoid repeated calls.
• Hoist context checks in function/symbol_collector.py by storing _is_load_context, _is_store_or_del_context, _is_declared_nonlocal_or_global, and _is_self_attribute_read into local variables and reuse them.
• Simplify module/symbol_collector.py ExceptHandler and _extract_target_names checks by caching handler_name and is_name locally.
• Reuse class_method_names and is_self_call in indirection/analyzer.py to avoid repeated lookups and string checks.

Testing

• Ran pytest -q in the repository root to exercise the test suite.
• Test run failed during collection with ModuleNotFoundError: No module named 'codra', so tests could not be executed to completion.

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Codex Task