docs: refresh README and testing guidance

[ryanbarlow97]

Add the missing Surefire result location alongside the existing coverage gates.

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: 5771f214-f8af-4a89-8d51-a0faca2572d5

📥 Commits

Reviewing files that changed from the base of the PR and between d3faa78 and 5ddc3a0.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified that test results are written to target/surefire-reports/.

Walkthrough

The README now states that Surefire writes test results to target/surefire-reports/.

Changes

Surefire report documentation

Layer / File(s)	Summary
Document the output directory README.md	The Tests and coverage section identifies target/surefire-reports/ as the Surefire test-results output directory.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Suggested reviewers: xxfran10xx

Merge Risk: ⚪ Minimal · up to 5ddc3

The README points to the directory used for test results; no actionable merge risk remains.

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

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