Migrate solution to the slnx format

[acopier]

It's much more readable and helps to avoid potential merge conflicts.

Summary by CodeRabbit

• Chores
  • Replaced the legacy solution file with a new solution descriptor that re-establishes the workspace and project listings.
  • Updated project configuration metadata to improve IDE and tooling compatibility across the repository.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Replaces the legacy Visual Studio solution file Obsidian.sln with a new Obsidian.slnx solution descriptor; project references and solution items are preserved and no public API or runtime logic is changed. (45 words)

Changes

Cohort / File(s)	Summary
Solution Format Migration Obsidian.sln, Obsidian.slnx	Removed legacy .sln (≈60 lines) and added .slnx (≈11 lines) that lists the same six projects and solution items; no code, API, or build logic changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐇 I hopped through files both old and new,
Swapped .sln for .slnx with a joyful chew,
Six projects snug in a tidy line,
Build's the same — but oh, how fine! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Migrate solution to the slnx format' accurately describes the main change: replacing Obsidian.sln with Obsidian.slnx.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@Obsidian.slnx`:
- Around line 1-11: The .slnx change is good but you must surface the minimum
tooling requirements mentioned in the review: add a clear note (e.g., in README
or CONTRIBUTING) stating that the .slnx format requires Visual Studio 2022
17.13+ or .NET SDK 9.0.200+ so contributors know how to open the Solution
element and included Project entries (Obsidian.API, Obsidian.ConsoleApp,
Obsidian.Nbt, Obsidian.SourceGenerators, Obsidian.Tests, Obsidian). Update the
repository documentation and/or CI checks to validate the required SDK/VS
versions.

[Tides]

LGTM

[acopier]

LGTM

Could you please approve this workflow?

[Tides]

LGTM

Could you please approve this workflow?

For some reason the build workflow isn't running but shouldn't be a problem, I'll merge in a sec