feat: SafeRegAlloc — stack-canonical register allocator for V1 correctness#129
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…tness SafeRegAlloc: correctness-first allocator. Every IR value in unique stack slot. Registers are instruction-local scratch only. No live value survives instruction boundary. Implements allocate(), frameSize(), scratch pool, safety assertions, written tracking.
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SafeRegAlloc — V1 correctness-first register allocator
Design
Core
allocate(fn): scans params + REG destinations, creates unique slotsframeSize(): totalSlots × 8 with 16-byte alignmentfindOrCreate/getSlot/slotByName: slot managementslotOffset/slotOffsetByName: stack offset computationScratch Pool
allocScratch/allocScratch2/allocScratch3: guaranteed distinct regsresetScratch: instruction boundary cleanupSafety Assertions
assertKnown(name): slot must exist before load/storeassertWritten(name): slot must be written before reloadassertClean(): no dirty scratch state at instruction boundaryWritten Tracking
markWritten/markValueWritten/markAllParamsWritten: track initializationisWritten/isValueWritten: query written stateDebug
dump(): full slot table with offsets, types, written flags