Package Wick.Server for NuGet release

[AlainDor]

Summary

• package Wick.Server alongside Wick.Runtime in the tag release workflow
• align public docs and server.json defaults around net10 server projects and net8 Wick.Runtime
• serialize Wick CI/release dotnet commands with -maxcpucount:1 after local default MSBuild exits with 0 errors on both main and this branch
• remove stale public PR-template reference to AGENTS.md

Verification

• git diff --check
• no top-level agent artifacts: find . -maxdepth 2 -name .agents -o -name .claude -o -name AGENTS.md -o -name CLAUDE.md -o -name WORKFLOW.md
• public artifact reference sweep: rg -n 'AGENTS.md|CLAUDE.md|WORKFLOW.md|.agents|.claude' .github README.md STATUS.md docs src server.json
• dotnet build Wick.slnx --configuration Release -maxcpucount:1
• dotnet test Wick.slnx --configuration Release --no-build --no-restore -maxcpucount:1 --logger trx --results-directory artifacts/TestResults
• dotnet pack src/Wick.Runtime/Wick.Runtime.csproj --configuration Release --no-build --no-restore -maxcpucount:1 --output artifacts/nuget
• dotnet pack src/Wick.Server/Wick.Server.csproj --configuration Release --no-build --no-restore -maxcpucount:1 --output artifacts/nuget

Notes

Default parallel dotnet restore/build/pack fails locally with no warnings or errors on origin/main and this branch; serialized MSBuild passed locally.