docs: refresh README and testing guidance

[ryanbarlow97]

Complete testing guidance and verify current build and first-start behavior.

Follows the README layout and documentation ownership rules in TF-Minecraft/Docs. Related guide updates: TF-Minecraft/Docs#110.

Validation: git diff --check; README links, source paths and anchors checked against the task worktrees. Feature and test claims checked against current source and build configuration. Plugin/runtime suites were not rerun for these documentation edits.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: debd7aaa-ef9b-4754-a6ba-0a42084cb95f

📥 Commits

Reviewing files that changed from the base of the PR and between ca3efb9 and b413e24.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified that CI uploads JaCoCo coverage reports and Surefire test results.
  • Specified that the listed test areas are covered by JUnit 5 tests.

Walkthrough

The README now identifies the JaCoCo and Surefire report locations and states that build CI uploads both. It also specifies that the listed test coverage uses JUnit 5.

Changes

README test and coverage

Layer / File(s)	Summary
Report and test details README.md	The coverage section names the JaCoCo HTML/XML and Surefire results locations, and states that build CI uploads both. The test-coverage description specifies JUnit 5.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to b413e

The README’s report and test guidance matches the repository configuration. No material merge-blocking issue is identified.

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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