chore(utils): trim runtime.ts to verified-live helpers

[bbopen]

Summary

• Remove the test-only clearRuntimeCache export from src/utils/runtime.ts.
• Preserve runtime detection caching while automatically invalidating its cache
  when the observable runtime globals change.
• Update runtime-detection tests to exercise the public detection surface.

What broke and why it cannot now

clearRuntimeCache was a testing hook in production runtime utilities with no
production or generated-template caller. Cache invalidation is now tied to the runtime discriminants
that select Node, Deno, Bun, browser, or unknown, so tests and embedders do not
need a mutable reset API to observe a changed environment.

BREAKING CHANGE

clearRuntimeCache is no longer exported. It was documented as test-only and
had no production caller in src/; consumers should call detectRuntime()
directly.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: a2c2fc0d-8610-46e8-9bbf-1d6e890039e1

📥 Commits

Reviewing files that changed from the base of the PR and between 344c9d7 and 737f0f7.

📒 Files selected for processing (4)

• src/utils/runtime.ts
• test/runtime_bun.test.ts
• test/runtime_detection.test.ts
• test/runtime_utils.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/0.9-runtime-utils-trim

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