fix(runtime): reject unsupported process architecture

[yordis]

• Prevents unsupported process architectures from running storage and replication code that relies on 64-bit runtime guarantees.
• Fails before node initialization so operators receive a deterministic startup result.

[cursor]

PR Summary

Low Risk
Adds an early startup guard and a small test rename; no changes to storage, replication, or auth paths.

Overview
The cluster node now fails fast at startup if it is not running as a 64-bit process, logging a fatal message and exiting with code 1 before configuration, logging setup, or vnode initialization.

Test coverage is aligned with that guarantee: VerifyIntPtrSize (asserting IntPtr.Size == 8) is removed and replaced by ProcessArchitectureTests, which asserts Environment.Is64BitProcess under the test suite’s expected runtime.

^{Reviewed by Cursor Bugbot for commit d0b50c9. Bugbot is set up for automated code reviews on this repo. Configure here.}

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: bfa5a474-874c-41e4-aee2-3280f2349762

📥 Commits

Reviewing files that changed from the base of the PR and between 6079ffd and d0b50c9.

📒 Files selected for processing (3)

• src/EventStore.ClusterNode/Program.cs
• src/EventStore.Core.Tests/ProcessArchitectureTests.cs
• src/EventStore.Core.Tests/VerifyIntPtrSize.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch yordis/fix-reject-32bit-process

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