suffix linter code

i forgot to publish that one, it is a dependency for the black -> ruff diff

rebase for minor change in Contributing.md

update Contributing.md and install dependencies script

split most newline changes into its own diff

i should be able to split this more, some changes are probably compatible with black (blank lines, bare tuples...)

In D18899#430955, @Fabien wrote:

why did you skip the linter ?

We fixed some of these issues with D7910 with some regex catching lists, dicts or set literals. But this is insufficient.

fix archived release notes

rebase

@bot build-ubsan

@bot build-chronik chronik-client-integration-tests

rebase

rebase

revert the hack introduced in D18876. This seems to be no longer needed after local_result = check() assigns a std::optional<std::pair<R, std::string>> rather than a std::optional<R> in CCheckQueue::Loop

newline

rebase

fix

try replacing std::optional<R> local_result with a bool has_local_result; + R local_result; (remember that we converge back to Core's solution in D18878, so the hack is temporary)

try decltype

probably https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107919, need to find a temporary workaround (the error goes away for some obscure reason in D18878)