docs: refresh README and testing guidance

[ryanbarlow97]

Move dependency setup into Docs and describe the test suite, reports and absence of a coverage threshold.

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: 913b04b2-9c2e-48bd-884f-b56fb0b8f9ad

📥 Commits

Reviewing files that changed from the base of the PR and between dba496f and 531b690.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated the test instructions with Java 21 and build-dependency prerequisites, plus the mvn clean verify command.
  • Added details on test coverage, report availability, and the test environment.

Walkthrough

The README replaces manual test setup instructions with Java 21 and prepared build dependencies, followed by mvn clean verify. It also documents test coverage, report handling, and the test environment.

Changes

Test documentation

Layer / File(s)	Summary
Document the test workflow README.md	The Tests section documents the prerequisites and mvn clean verify command. It describes JUnit 5 and Mockito coverage, Surefire report handling, the absence of a configured coverage report or threshold, and testing without a live server or real economy and faction plugins.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to 531b6

This is a documentation-only update to the test instructions. It does not change runtime behavior and has no merge-blocking risk.

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

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