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717ff62d70
Preparatory refactor for the shared-CFG dataflow migration. Deprecates the AstNode.getAFlowNode() cached predicate on the public Python QL API and rewrites all ~140 internal callers across lib/, src/, test/, and tools/ from `expr.getAFlowNode() = cfgNode` to `cfgNode.getNode() = expr`, using ControlFlowNode.getNode() which already exists in Flow.qll. The predicate itself is preserved (with a deprecation note pointing at the new pattern) so external users do not experience churn — they can migrate at their own pace and the AST/CFG hierarchies still get the intended untangling once the deprecation eventually elapses. Semantic noop verified by: - All 361 lib/ + src/ queries compile clean. - All 122 ControlFlow + PointsTo library-tests pass. - All 64 dataflow library-tests pass. - All 113 Variables/Exceptions/Expressions/Statements/Functions/Imports/ Security/CWE-798/ModificationOfParameterWithDefault query-tests pass. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>