* test: test api calls
* chore: add docs
* chore: fix cspell
* fix: use no-op network hooks in multi_engine tests
Set no-op network hooks after init_for_testing so the fire-and-forget
thread spawned by report_launch_success completes instantly without
network I/O, preventing leaked threads from interfering with subsequent
serial tests that use mock servers.
Eric Seidel