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Style cleanup: avoid naming newtype branch constructors (TPyStmt, TPyExpr, TBlockStmt, TPattern, TBoolExprPair, TScope) outside the char-preds that classify their wrappers. Method bodies and helper predicates now use the as* projections instead: // Before: result = TBlockStmt(ifStmt.getBody()) // After: result.asStmtList() = ifStmt.getBody() // Before: result = TPyStmt(matchStmt.getCase(index)) // After: result.asStmt() = matchStmt.getCase(index) Adds: - AstNode.asStmtList() - the inverse of TBlockStmt(_). - BinaryExpr.getIndex() - exposes the synthetic-pair index, used internally by getRightOperand to find the next pair without naming TBoolExprPair. No behaviour change: all 24 NewCfg evaluation-order tests pass; all 11 shared-CFG consistency queries report 0 violations on CPython. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>