docs: Clarify project maturity level in the README

[grahamking]

"v0.2" should have made this obvious already, but more honestly can't
hurt.

Signed-off-by: Graham King grahamk@nvidia.com

Summary by CodeRabbit

• Documentation
  • Added a maturity notice explaining that Switchyard is pre-alpha, rapidly evolving, and not intended for production use.
  • Clarified that APIs and algorithms may change significantly before version 1.0.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 74b8990 and cd3f91e.

📒 Files selected for processing (1)

• README.md

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Walkthrough

The README now states that Switchyard is pre-alpha, subject to significant API and algorithm changes before v1.0, and not intended for production use.

Changes

Maturity documentation

Layer / File(s)	Summary
Add maturity notice README.md	Adds a Maturity section that documents pre-alpha status, expected breaking changes, and the production-use warning.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit reads the README bright,
“Pre-alpha” marks the path in sight.
APIs may change and hop,
So production use must stop.
🐇 Clear warnings guide the way.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the README change that clarifies the project's maturity level.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

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