feat/interpret uhir#9
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Use the actual loop latch as the true-input predecessor when lowering loop metadata, and resolve flattened block phi nodes against the current predecessor by replacing matching phis with moves. This preserves the correct carried value when sequential loop bodies are emitted as a single region.
Cover seq-stage execution of a loop whose header phis receive values from a separate latch block, including latch phis that select between multiple body predecessors. This guards correct predecessor handling through seq lowering and µhIR interpretation.
Keep flattened loop-body phis intact during seq lowering so downstream µglIR phi-carry lowering still sees the original latch structure. Move the interpreter-only fallback into the µhIR interpreter: when a flattened synthetic region reaches a phi without an explicit predecessor label, resolve the latest available incoming operand from execution state.
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adds a µhIR Interpreter module: