docs: refresh README and testing guidance

[ryanbarlow97]

Move metrics details into Docs and complete testing instructions and report locations.

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: 8ad28441-8573-4a53-a3c3-bfeb5ed0e404

📥 Commits

Reviewing files that changed from the base of the PR and between 9bad61d and ad561c6.

📒 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.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Expanded the Tests section with covered test areas, separate instruction and branch coverage reporting, and report locations.
  • Added details on when the Build workflow runs verification and uploads reports.
  • Removed descriptions of locomotive coverage and bundled bStats.

Walkthrough

The README Tests section now describes covered test areas, report locations, separate instruction and branch coverage, and Build workflow triggers and uploads. It removes the previous locomotive and bStats coverage description.

Changes

Test documentation

Layer / File(s)	Summary
Tests section and report details README.md	The Tests section lists covered areas, gives the Surefire and JaCoCo report locations, and states that instruction and branch coverage are reported separately. It describes the Build workflow’s verification triggers and report uploads. The previous locomotive and bStats coverage details are removed.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: carolinebondhus

Merge Risk: ⚪ Minimal · up to ad561

The README updates are documentation-only, and the JaCoCo coverage statement matches the project configuration. No actionable merge blocker remains.

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

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