Sampling binary profiles do not record the profiling mode

Bug report

Bug description:

The sampling binary header does not record --mode. Replay and differential flamegraphs therefore cannot describe or validate how the baseline was collected.

python -m profiling.sampling run --mode cpu --binary -o baseline.bin demo.py
python -m profiling.sampling replay --flamegraph -o replay.html baseline.bin
python -m profiling.sampling run --mode wall --diff-flamegraph baseline.bin -o diff.html demo.py

The replay has no CPU-mode metadata, and the differential run silently compares a CPU baseline with a wall-time profile. These measurements are not comparable.

CPython versions tested on:

3.16

Operating systems tested on:

Linux

Linked PRs

• gh-154105

从报告中的 profiling.sampling run 和 replay 命令开始，使用 CPU 和 wall-time 示例来复现缺失的元数据以及不匹配的比较结果。阅读二进制 profile header 的处理逻辑，以及 replay 和 differential flamegraph 的入口点。当 profiling 模式保留在二进制文件中，并可用于 replay 或 differential validation 时，即表示完成。