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[rust-compiler] Document test-babel-ast.sh status in TODO #36521

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Expand Up @@ -145,6 +145,26 @@ Expect significant overlap with the SWC Group C bugs (cast wrappers,
type annotations, UTF-16/WTF-8 handling) since both frontends share the
post-conversion pipeline.

## test-babel-ast.sh status

Separate from the e2e variants above, `compiler/scripts/test-babel-ast.sh`
runs three `react_compiler_ast` integration tests against the same fixture
set. All three are green end-to-end:

| Sub-test | Score |
| ------------------------- | ------------ |
| `round_trip_all_fixtures` | 1779 / 1779 |
| `scope_info_round_trip` | 1780 / 1780 |
| `scope_resolution_rename` | 1779 / 1779 |

One fixture is excluded from the two round-trip tests pending the WTF-8
work documented under [SWC Group C](#group-c-real-swc-frontend-bugs)
above: `lone-surrogate-string-values.js`. Babel's `JSON.stringify` emits
lone surrogate escapes like `"\uD83E"` which `serde_json` cannot
materialize into Rust `String`. The skip keeps the rest of the suite
green; the proper fix lives with the SWC Group C entry (same root
cause, broader impact).

## How this stack got here

- `compiler/scripts/test-e2e.sh --variant swc` baseline was 1742 / 1795
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