Problem

compatForm wraps reactive FormControls, but the signal-forms required state does not reflect a wrapped control that has Validators.required. This leaves FieldTree#required false even when the reactive control reports the required validator.

Fixes #68905.

Root cause

Compat field nodes inherit FieldNode.required, which only reads signal-forms REQUIRED metadata. Reactive form validators on the wrapped AbstractControl are not included in that metadata.

Solution

Expose required from CompatFieldNode by deriving a signal from the wrapped control's hasValidator(Validators.required) state, using the existing control-status signal helper so validator updates and control swaps are observed.

Tests run

• corepack pnpm bazel test //packages/forms/signals/test/node:test --test_arg=--filter='picks up the required state from a reactive form control' --test_output=errors
• corepack pnpm bazel test //packages/forms/signals/test/node:test --test_output=errors
• npx --yes prettier@3.8.3 --check packages\forms\signals\compat\src\compat_field_node.ts packages\forms\signals\test\node\compat\compat.spec.ts
• git diff --check