docs: refresh README and testing guidance

[ryanbarlow97]

Move recovery, command and dependency details into Docs; document current tests and coverage reports.

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: a503de1c-b7be-4aff-a07f-eab72e228da7

📥 Commits

Reviewing files that changed from the base of the PR and between 0c509ef and 817af97.

📒 Files selected for processing (1)

• README.md

Included review availability: This review used your included allowance. Your plan provides up to 1 included review per hour; 0 remain after this review.

---

📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated recipient opt-out guidance: characters can be hidden through RPCharacters, and mail that has already been sent still arrives.
  • Clarified testing prerequisites and instructions, including Java 21 and the mvn clean verify command.
  • Added details on the test scope, JaCoCo HTML and XML report locations, and report directories uploaded by the Build workflow.

Walkthrough

The README revises the recipient mail opt-out description and updates the test prerequisites, verification command, coverage summary, and JaCoCo report locations.

Changes

README updates

Layer / File(s)	Summary
Mail and test guidance README.md	The opt-out description no longer lists RPCharacters commands or says mail is returned before sender confirmation. The Tests section now specifies Java 21, mvn clean verify, JUnit 5 and Mockito coverage, JaCoCo report locations, and report directories uploaded by the Build workflow.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 817af

The updated test guidance preserves the build prerequisites and matches the reported artifact locations. The documentation change is ready to merge after normal checks.

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

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}