GH Actions (and most shared) CI runners are slow + noisy and —
unlike a throttled local box — don't expose CPU-freq scaling via
sysfs, so `cpu_scaling_factor()` read `1.0` and the timing-
sensitive deadlines/asserts that key off it got NO headroom on
CI (a class of `TooSlowError` / `assert diff < this_fast` flakes),
- add a flat `_ci_env` x2 bump inside `cpu_scaling_factor()` so
every test already using it (quad streaming, SIGINT-cancel,
docs examples, ...) gets CI headroom for free — compounds with
any local-throttle factor.
- route the `time_quad_ex` cancel-deadline through it instead of
a bespoke per-test `ci_env` bump.
- fix a real bug in `test_nested_multierrors`: its OUTER
`@tractor_test(timeout=10)` was *smaller* than the inner
`fail_after_w_trace` budget (trio depth=3 = 12s), so the outer
wall fired first and pre-empted the snapshot-capturing inner
deadline -> `FAILED` instead of dumping. Bump the outer to `40`
(> max inner budget) and scale the inner budgets by
`cpu_scaling_factor()` too.
Verified locally with `CI=1` (quad + both `test_nested_multierrors`
depths + `test_cancel_via_SIGINT_other_task` green).
(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
Gud Boi
7b518fe4e1