Document SQL parameter name simplification as a low-impact breaking change in EF Core 10

[Copilot]

dotnet/efcore#35200 simplified generated SQL parameter names (dropping the __ prefix and trailing counter), which was not yet captured in the EF Core 10 breaking changes page.

Changes

• Summary table: Added a SQL parameter names are now simplified row (Low impact) to entity-framework/core/what-is-new/ef-core-10.0/breaking-changes.md.
• New section: Added the corresponding Old behavior / New behavior / Why / Mitigations entry. Mitigations note this is transparent except for code depending on exact parameter names (SQL snapshot tests, interceptors/loggers parsing CommandText or ParameterName).

Behavior documented

-- Before
@__city_0='London'
WHERE [b].[City] = @__city_0

-- After
@city='London'
WHERE [b].[City] = @city

Note

The issue referenced for context (efcore#38478) is an unrelated NuGet version-mismatch bug report; the content here is based on PR #35200 and the existing whatsnew.md entry describing the @__city_0 → @city change. The section cites the PR rather than that issue.

[Copilot]

Pull request overview

Documents an EF Core 10 low-impact breaking change where generated SQL parameter names are simplified (e.g., @__city_0 → @city) so that the breaking changes page matches the behavior introduced in dotnet/efcore#35200.

Changes:

• Added a new “SQL parameter names are now simplified” entry to the EF Core 10 breaking changes summary table (Low impact).
• Added a full breaking-change section describing old/new behavior, rationale, and mitigations for code that depends on exact parameter names.

[Copilot]

Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.