fix Go-to-def fails on unreachable branches #1254 #1523
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fix #1254
Added a suppression stack so binding code can execute unreachable branches without emitting type errors and exposed a helper to gate this behavior to filesystem/memory modules only, skipping
builtins/__builtins__.Updated the if binding logic to analyze statically false branches only when the new gate allows it, then discard their flow so control-flow facts stay unchanged while IDE features (like go-to-def) gain the needed Keys.