Make @useFinalStateVia validation decorator-order independent for PUT operations

[Copilot]

@useFinalStateVia("original-uri") could incorrectly report invalid-final-state when @put was applied before/after it in a different order. The validator was effectively sensitive to decorator execution order instead of final operation shape.

• Post-decorator validation for @useFinalStateVia

  • Moved @useFinalStateVia validation into a decorator post-validation callback (onTargetFinish).
  • This evaluates HTTP verb/final-state constraints after all decorators on the target operation are applied, removing order dependency.

• Regression coverage for the reported ordering bug

  • Added a test for:
    • @put @useFinalStateVia("original-uri") on an LRO operation
  • Asserts no invalid-final-state diagnostic and confirms the override is stored as original-uri.

• Behavioral impact

  • No rule semantics changed; only validation timing changed to match final decorated operation metadata.

@pollingOperation(bar)
@test @put @useFinalStateVia("original-uri")
op foo(): {};

[timotheeguerin]

@copilot use expectDiagnostics

[Copilot]

Updated in a6f3eb9: the regression test now uses expectDiagnostics(diagnostics, []).

[timotheeguerin]

@copilot run formatter

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@azure-tools/typespec-azure-core@4394

commit: 1dc3dfa

[Copilot]

@copilot run formatter

Done in 93ef2cc. I ran the formatter and committed the resulting formatting-only update in use-final-state-via.test.ts.

[azure-sdk]

All changed packages have been documented.

• ✅ @azure-tools/typespec-azure-core

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@azure-tools/typespec-azure-core - fix ✏️

Make @useFinalStateVia validation decorator-order independent for PUT operations.

[azure-sdk]

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