Update upgrade tracking files

.github/upgrades/execution_log.md

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+# Execution Log — .NET 10.0 Upgrade
+
+## Summary
+
+- **Status**: ? Complete
+- **Branch**: `upgrade-to-NET10`
+- **Commit**: `0db3c51` — "Upgrade to .NET 10.0 — update framework and packages"
+- **Total Tasks**: 5/5 completed, 0 failed, 0 skipped
+
+---
+
+## Task Execution Log
+
+### TASK-001: Verify Prerequisites ?
+- .NET 10 SDK: installed and available
+- global.json: no file found, no conflicts
+- Branch: `upgrade-to-NET10` confirmed
+
+### TASK-002: Update Target Framework ?
+- Updated `AutoBidder.csproj` line 4: `net8.0` ? `net10.0`
+
+### TASK-003: Update NuGet Packages ?
+- `Microsoft.AspNetCore.Identity.EntityFrameworkCore`: 8.0.0 ? 10.0.5
+- `Microsoft.EntityFrameworkCore.Sqlite`: 8.0.0 ? 10.0.5
+- `Npgsql.EntityFrameworkCore.PostgreSQL`: 8.0.0 ? 10.0.1
+- `dotnet restore` completed with 0 dependency conflicts
+
+### TASK-004: Build and Fix Compilation Errors ?
+- Build succeeded on first attempt with 0 errors
+- No compilation fixes needed
+
+### TASK-005: Commit and Final Validation ?
+- All Plan §11 success criteria verified
+- Committed: `0db3c51` on `upgrade-to-NET10`
+
+---
+
+## Files Modified
+
+- `Mimante/AutoBidder.csproj` — TargetFramework + 3 PackageReference versions
+- `.github/upgrades/assessment.md` — Created during analysis
+- `.github/upgrades/plan.md` — Created during planning
+- `.github/upgrades/tasks.md` — Created and tracked during execution