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feat(test): add assert_raise and expect_error helpers

`try?` will be deprecated in favor of native `raise`, but tests still
need a clean way to assert that a callback raises. Split the use case
into two helpers:

- `@test.assert_raise(f)` for "I just want to assert it raises" — no
  return value, no `let _ =` ceremony at the call site.
- `@test.expect_error(f)` for "give me the error so I can interrogate
  it" — returns the raised error so the caller can compose with
  `inspect`, `guard ... is`, or `assert_true(... is ...)`.

Both helpers fail at the call site (with location info) when the
callback does not raise. Signatures use open `raise` to match the
existing test-helper convention (`fail`, `assert_same_object`).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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