Implement and harden for loops - #124
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Add range and sequence iteration, break/continue CFG topology, structured HIR/MIR lowering, ownership-safe cleanup, and target-sized sequence indexes. Add focused parser, semantic, CFG, ownership, HIR, MIR, backend, and source fixture coverage. Helpers centralize generated loop artifacts and loan-lifetime invariants rather than forwarding existing behavior. Validated with go test -count=1 ./..., a fresh compiler bundle, the full uncached x_test suite, and 386/amd64 LLVM checks through clang.
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Summary
forloops with value-only and index/value bindingsbreakandcontinuethrough canonical CFG init/header/body/latch/exit topology with exact-site ownership cleanupValidation
go test -count=1 ./...go run ./scripts/bundle.goPEEPER_BIN="$PWD/build/bin/peeper" go test ./x_test -count=1git diff --checkRules check
No pass-through compatibility wrappers, stale aliases, ignored parameters, fake source identities, duplicate iterator discovery, or backend-specific loop path were added. Generated-artifact helpers and loan filtering centralize phase-local invariants.
Closes #31.
User-defined iterator protocol remains separate follow-up: #123.