selectFormStrategy_AddFuelView_L3 should use FormLayoutDecision (currently hardcoded)

[schatt]

Summary

selectFormStrategy_AddFuelView_L3(layout:) currently ignores layout and returns a hardcoded FormStrategy (.form / .standard / .realTime). Production comments say this is temporary until the intelligent system lands.

Found while making L3 unit tests honest under #382 — the old test implied layout→strategy mapping by comparing strategy fields to the input layout while feeding values that matched the hardcode.

Desired behavior

• Strategy fields should derive from (or at least respect) the supplied FormLayoutDecision, or
• If hardcoding remains intentional for a named domain stub, document that clearly in API docs and drop the unused layout parameter (or rename / replace with a non-misleading API).

Out of scope

#382 only fixes the test to assert the current hardcoded contract (and documents ignore-layout). Product change lives here.

References

• Framework/Sources/Layers/Layer3-Strategy/PlatformStrategySelectionLayer3.swift — selectFormStrategy_AddFuelView_L3
• Parent honesty sweep: Eliminate tautological Bool(true)/Bool(false) test expects #382

[schatt]

Honest unit coverage for current stub behavior lives on #382 (testSelectFormStrategy_AddFuelView_L3): layout deliberately differs from the hardcode; asserts document .form/.standard/.realTime ignore-layout. This issue owns making the production API use (or stop pretending to take) FormLayoutDecision.