docs: refresh README and testing guidance

[ryanbarlow97]

Complete test framework, report location and runtime limitation guidance.

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: f0469789-4f2d-4b64-a4e3-29a9d3614116

📥 Commits

Reviewing files that changed from the base of the PR and between a0d8a9f and f44c7a1.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified test requirements, coverage, report locations and workflow uploads.
  • Noted that tests do not launch a live Paper server or verify title rendering.

Walkthrough

The README test instructions no longer require private plugin JARs. They describe the test frameworks and coverage, Surefire report output and upload, and limitations of the tests.

Changes

Test documentation

Layer / File(s)	Summary
Test instructions README.md	The instructions describe JUnit 5, Mockito and MockBukkit coverage, report output and upload, and test limitations. The Java 21 verification command and coverage statement remain.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to f44c7

The updated test guidance is consistent with the checked-in coverage configuration and workflow; no merge-blocking risk remains.

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

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