docs: refresh README and testing guidance

[ryanbarlow97]

Document test frameworks, prerequisites, report paths and live integration limitations.

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]

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ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 1fa20297-976f-4de6-8815-cff2fbbe297a

📥 Commits

Reviewing files that changed from the base of the PR and between ceeb5b4 and dfa8448.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified testing prerequisites, the roles of the test frameworks, and the 100% production line coverage requirement.
  • Specified where test and coverage reports are found, and distinguished automated tests from live integration checks.

Walkthrough

The README now documents test prerequisites, frameworks, coverage enforcement, report locations, and the distinction between automated tests and live integration checks.

Changes

Testing documentation

Layer / File(s)	Summary
Test and report guidance README.md	The instructions specify Java 21 and prepared build dependencies, name JUnit 5, Mockito, and MockBukkit, and describe JaCoCo’s 100% production line-coverage rule. They identify Surefire and JaCoCo report locations, state that the Build workflow uploads both report directories, and list live integration checks not covered by automated tests.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to dfa84

The testing guidance is ready to merge after normal documentation checks.

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

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