cue/testdata/eval: convert eval txtar tests to inline @test format
Convert the remaining eval testdata files from golden-file format to
inline @test(...) annotations. Each converted file gets:
- @test(eq, ...) on fields with expected values
- @test(err, code=..., pos=[...]) on error-bearing fields
- a #-prefixed header comment explaining what the test covers
- out/errors.txt section for documentary error output
Also update CLAUDE.md guidelines for inline test conversion and
cue/testdata/readme.md to reflect the new annotation style.
Signed-off-by: Marcel van Lohuizen <mpvl@gmail.com>
Change-Id: I718878e340a8dbdb3f3bcce8506f0da1f38e538c
Reviewed-on: https://cue.gerrithub.io/c/cue-lang/cue/+/1234945
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>
Reviewed-by: Daniel Martí <mvdan@mvdan.cc>
Unity-Result: CUE porcuepine <cue.porcuepine@gmail.com>