Sashiko v.0.2.0 release

Hello,

Sashiko v.0.2.0 has been released and deployed.

Most notably, reviews got on average ~2.5x faster: from ~35 min to <15min.
This should affect local setups as well, assuming you're not throttled
by your LLM provider.

To achieve this I had to completely rework the LLM toolbox to allow
running stages 1-7 in parallel. As a bonus, it's overall better and more
consistent now and I saw a small bump in the findings rate, which
balanced recent changes by Muchun Song which forced stages 1-7 to record
dismissed concerns and added a new stage to evaluate consolidated raised
concerns vs dismissed concerns. These changes should reduce the false
positive rate, but it's harder to measure directly. The new toolbox is
also fixing a rare issue when an earlier stage was checking out some
earlier commit, which was confusing later stages (thanks to Tamir
Duberstein for reporting it!).

The web site is also much more responsive now, it was a bit sluggish
recently.

Token usage is slightly up (10-15%); mostly because of an additional
review stage.

Also pulled latest subsystem prompts changes from the review-prompts
repository.

Thanks,
Roman