Add commits index and sync benchmarks

[myieye]

Adds various sync benchmark tests.
The motivation for this is that I was exploring performance optimizations and having a benchmark in place lets me/us actually measure those optimizations.
This PR includes the first and smallest optimization: a DB index on the commit order columns.
So, now there are 2 Comment lines per benchmark documenting the approximate speedup that the index resulted in.

Hopefully future PRs will add more radical speedups.

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Configuration used: Repository UI

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Run ID: 4ae3ff7e-44ad-41bf-a2e9-d6d223bd3ee3

📥 Commits

Reviewing files that changed from the base of the PR and between 1232eea and f29fa44.

📒 Files selected for processing (11)

• .github/workflows/fw-lite.yaml
• backend/Directory.Packages.props
• backend/FwLite/FwLiteProjectSync.Tests/BenchmarkSupport.cs
• backend/FwLite/FwLiteProjectSync.Tests/Fixtures/Sena3Collection.cs
• backend/FwLite/FwLiteProjectSync.Tests/FwLiteProjectSync.Tests.csproj
• backend/FwLite/FwLiteProjectSync.Tests/Sena3SyncTests.cs
• backend/FwLite/FwLiteProjectSync.Tests/SyncBenchmark.cs
• backend/FwLite/FwLiteProjectSync.Tests/SyncMutationBenchmark.cs
• backend/FwLite/FwLiteProjectSync.Tests/XUnitBenchmarkLogger.cs
• backend/FwLite/LcmCrdt/Migrations/20260506150734_AddCommitsOrderIndex.Designer.cs
• backend/FwLite/LcmCrdt/Migrations/20260506150734_AddCommitsOrderIndex.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sync-perf-benchmarks

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[github-actions]

C# Unit Tests

165 tests   165 ✅  18s ⏱️
 23 suites    0 💤
  1 files      0 ❌

Results for commit f29fa44.

♻️ This comment has been updated with latest results.

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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	May 7, 2026, 4:02 PM

[github-actions]

UI unit Tests

  1 files   59 suites   30s ⏱️
176 tests 176 ✅ 0 💤 0 ❌
245 runs  245 ✅ 0 💤 0 ❌

Results for commit f29fa44.

♻️ This comment has been updated with latest results.

[myieye]

@coderabbitai full review

[coderabbitai]

✅ Actions performed

Full review triggered.

[rmunn]

@myieye - I merged #2262, so you might want to rebase on top of develop. They maybe you can use the NuGet package you were talking about so you don't have to create the index manually.