补 shift 随机对照测试与 scalar CI job - #4
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- shift_left/right 新增 256 位随机对照测试（64 组，count∈[0,Bits]），逐 bit 参考模型对照，覆盖手工用例未碰的中间 shift 值 - reference_model.hpp 新增 reference_shift_left/right 逐 bit 参考实现 - random_cases.hpp 新增 random_shift_case 生成器 - CI 新增 scalar build/test job（-mno-avx2 + BITCAL_NATIVE_ARCH=OFF），覆盖 BITCAL_HAS_AVX2==0 分支；此前 CI 两 job 均走 AVX2 路径 - README/AGENTS/CHANGELOG 同步描述
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变更
补 shift 操作的随机对照测试，并新增 scalar CI job 覆盖
BITCAL_HAS_AVX2 == 0编译分支。测试
shift_left/shift_right新增 256 位随机对照测试（各 64 组，count ∈ [0, Bits]），对照逐 bit 参考模型reference_shift_left/reference_shift_rightrandom_cases.hpp新增random_shift_case生成器；reference_model.hpp新增逐 bit 参考实现CI
build-and-test-scalarjob（GCC +-mno-avx2+BITCAL_NATIVE_ARCH=OFF），覆盖 scalar 分支-march=native），scalar 分支从未被编译/测试文档
README/AGENTS §4.3/CHANGELOG同步描述验证
-march=native）+ scalar build（-mno-avx2）：均 45 passed / 0 failedshift_left_array（丢跨 word carry），test_random_shift_left_256如预期失败；128 位手工用例在 mutation 下仍 PASS，印证随机测试覆盖了手工用例未碰的中间 shift 值