* main: (65 commits)
  [ty] Some more simplifications when rendering constraint sets (#21009)
  [ty] Make `attributes.md` mdtests faster (#21030)
  [ty] Set `INSTA_FORCE_PASS` and `INSTA_OUTPUT` environment variables from mdtest.py (#21029)
  [ty] Fall back to `Divergent` for deeply nested specializations (#20988)
  [`ruff`] Autogenerate TypeParam nodes (#21028)
  [ty] Add assertions to ensure that we never call `KnownClass::Tuple.to_instance()` or similar (#21027)
  [`ruff`] Auto generate ast Pattern nodes (#21024)
  [`flake8-simplify`] Skip `SIM911` when unknown arguments are present (#20697)
  Render a diagnostic for syntax errors introduced in formatter tests (#21021)
  [ty] Support goto-definition on vendored typeshed stubs (#21020)
  [ty] Implement go-to for binary and unary operators (#21001)
  [ty] Avoid ever-growing default types (#20991)
  [syntax-errors] Name is parameter and global (#20426)
  [ty] Disable panicking mdtest (#21016)
  [ty] Fix completions at end of file (#20993)
  [ty] Fix out-of-order semantic token for function with regular argument after kwargs (#21013)
  [ty] Fix auto import for files with `from __future__` import (#20987)
  [`fastapi`] Handle ellipsis defaults in FAST002 autofix (`FAST002`) (#20810)
  [`ruff`] Skip autofix for keyword and `__debug__` path params (#20960)
  [`flake8-bugbear`] Skip `B905` and `B912` if <2 iterables and no starred arguments (#20998)
  ...