[Ramses Sanchez-Hernandez (ramsessanchez)]

Changes proposed in this pull request

DevX ignores singularizeOperationIds with style=Plain. Switching the Kiota-compatible download to style=Powershell would remove schema features needed by Kiota. This change retains the Plain document and changes only its operation IDs, reducing the translation needed to migrate existing operation-ID-based directives.

• Enable singularized operation IDs in the v1.0 and beta Kiota-compatible refreshes. Download the document with fileName=openapi&style=Plain, request a companion view of the same source with style=Powershell&singularizeOperationIds=true&format=json, and copy only the IDs matched by exact path and HTTP method. Missing or ambiguous mappings fail explicitly; reference request failures cannot silently leave mixed naming.
• Run TweakOpenApi.ps1 -OperationIdsOnly for the Kiota-compatible documents. Reuse the existing preposition/word corrections without rewriting response codes, navigation properties, schemas, parameters, or other content. Preserve quotes, comments and line endings; ignore JSON removal reports and subdirectories. The default PowerShell tweak behavior remains enabled for the existing flow.
• Add focused regression coverage and document the refresh behavior. Allow empty lines in the deprecation pruner's line-array parameters so normal YAML final newlines do not break the combined refresh.

Example: auditLogs.auditLogRoot.UpdateAuditLogRoot becomes auditLog.auditLogRoot_UpdateAuditLogRoot, while discriminators, anyOf/oneOf, additional properties and navigation properties remain intact.

Validation

• Invoke-Pester -Path @('.\tools\Tests\KiotaCompatOperationIds.Tests.ps1', '.\tools\Tests\Remove-ExpiredDeprecatedOpenApiOperations.Tests.ps1') -Output None -PassThru — passed: 30 tests. Includes both refresh profiles, exact non-ID content preservation, quoted IDs, compatibility corrections, missing mappings, retries/reference failures, unchanged default tweaks, and deprecation pruning.
• Live Reports downloads for v1.0 and beta — passed: after masking operation-ID lines, output matched the Plain source exactly; all 110 v1.0 / 381 beta common operations matched the IDs in the PowerShell-source document after the existing tweaks. Pruning also completed for both profiles.
• kiota generate -d (Join-Path $validationRoot 'v1.0\Reports.yml') -l CSharp -c ReportsClient -n Microsoft.Graph.OperationIdValidation -o (Join-Path $validationRoot 'client') --log-level Warning — passed with Kiota 1.34.1, generating 326 C# source files ($validationRoot was temporary validation output). Kiota reported unresolved discriminator-reference warnings in the sliced schema, but no operation-ID/duplicate warnings.
• git --no-pager diff --cached --check — passed.

No committed OpenAPI corpus, generated clients/wrappers, or directive migration ledgers are regenerated here; the naming changes take effect on the next refresh. Full wrapper gates were not run because this PR changes refresh tooling rather than generated wrapper output.

Other links

• DevX PowerShell operation-ID formatter
• DevX styling also removes anyOf/oneOf
• Existing PowerShell OpenAPI refresh