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a20af3cf41
Adds an `AnnAssignStmt` wrapper in `AstNodeImpl.qll` so that PEP 526 annotated assignments (`x: int = 1`, `x: int`) participate in the control flow graph. Evaluation order follows CPython: annotation, optional value, target binding. Without this, `x: int = 1` had no CFG node for `x` even though `Name.defines(v)` returns true for it on the AST side. SSA built on the new CFG would therefore miss every annotated-assignment write. Removes the corresponding MISSING: annotations from the CFG-binding gap test: - annassign.py — all four cases now green. - match_pattern.py — class-body annotated fields (`x: int`, `y: int`). - type_params.py — `item: T` inside class. Verified: all 24 ControlFlow/evaluation-order tests still pass. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>