docs: refresh README and testing guidance

[ryanbarlow97]

Move dependency preparation into Docs and clarify sales tests, report locations and live integration limits.

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

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• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: 04fcbe0a-5123-4b88-bdf4-b6ff0e762ab3

📥 Commits

Reviewing files that changed from the base of the PR and between 5d0da80 and fab25a6.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated the testing guidance to refer to sales and link to shared dependency documentation.
  • Added JaCoCo report locations and noted which integrations require server testing.

Walkthrough

The README now links to the pinned shared dependencies documentation and uses mvn clean verify in its setup instructions. It updates the test description and adds report locations and live-server testing caveats.

Changes

README test guidance

Layer / File(s)	Summary
Setup and test instructions README.md	Setup instructions link to the pinned shared dependencies documentation and use mvn clean verify. Test guidance describes sales, lists Surefire report locations, and notes integrations that still require server testing.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to fab25

The README updates are suitable to merge with normal documentation checks.

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

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