Add sync benchmarks

[myieye]

Reopening of #2254
(I used the "Sync" button in VS Code and that resulted in the old PR getting merged into develop...oops.
So, I force pushed to develop to clean it up.)

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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📥 Commits

Reviewing files that changed from the base of the PR and between 52ae636 and e1a5eac.

📒 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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Build	Status	Details	Updated (UTC)
default (Inspect)	✅ No changes detected	-	May 19, 2026, 12:05 PM

[github-actions]

UI unit Tests

  1 files  ±0   59 suites  ±0   26s ⏱️ -5s
176 tests ±0  176 ✅ ±0  0 💤 ±0  0 ❌ ±0 
245 runs  ±0  245 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit e1a5eac. ± Comparison against base commit 52ae636.

♻️ This comment has been updated with latest results.

[github-actions]

C# Unit Tests

165 tests  ±0   165 ✅ ±0   20s ⏱️ ±0s
 23 suites ±0     0 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit e1a5eac. ± Comparison against base commit 52ae636.