[sadeqabuhattem]

Moves the four DotNetBoost.Settings.* and four DotNetBoost.MultiLingual.* packages from 1.0.0-preview.2 to 1.0.0-preview.3. Media and Auditing stay on preview.2.

Settings

• SettingGroupAuditObserver (an ISettingWriteObserver, which ran after the commit) becomes SettingGroupAuditParticipant (an ISettingWriteParticipant).
• The participant enlists the audit entry and each of its change rows through EfCoreSettingWriteScope.Add. The entry now commits in the settings store's own save, or not at all. A failure to record fails the request instead of being logged and swallowed.
• The group's class comes from SettingWrite.GroupType, so the assembly scan that rebuilt the name-to-type map is gone.

MultiLingual

• TranslatedText writes through SetAll and reads through GetAllAsync(includeBase: true). It no longer switches the request into the base language, and Assign / WithBaseValues are gone.
• Creates use a new CreateAsync, which gives "" to any base-language property the body left out. Without it, a create under Accept-Language: ar without every English property would be refused (409).
• Category and Product keep their HiLo keys. Preview.3 fixed the nested-save problem on MultiLingual's side, but the nested save is Auditing's, so the comments now give that as the reason.

Tests

Three new tests, 160 → 163:

• a settings save's entry commits in the caller's save;
• a settings write that fails after the entry is enlisted leaves neither the group change nor the entry (a test-only participant fails the write on purpose);
• a create under another language without every base property still answers 201.

The README, ARCHITECTURE-SLICES.md and the documented test counts are updated to match.

Verification

• dotnet test -p:UseLocalDotNetBoost=false (published NuGet packages): 163/163 pass.
• dotnet test with the local workspace (sibling library sources): 163/163 pass.
• The build shows Source control information is not available warnings. These come from the published Settings preview.3 packages, which list Source Link as a dependency; it's fixed in dotnetboost/settings but not released yet.

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