docs: trim the README to the repository norm

[ryanbarlow97]

Summary

• Removes the technical sections (locomotive overdrive, train wheel animations, laying curves, junctions in reverse, track ends, bogies and skins, walkable decks), which now live in the Docs Trains guide.
• Uses the standard Documentation links, keeping the user guide link as an extra line.
• Adds a short Tests section (JUnit 5 and Mockito, run by the Build workflow; no coverage gate).

Paired Docs PR: TF-Minecraft/Docs#98. Merge the Docs PR first or together with this one.

Checks

• README only; no code or build changes.
• Moved content verified against main (LocomotiveOverdrive, TrainHandler, Bogies, Deck, TrackCurve, trains.yml).

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Reorganised the README around links to the project documentation and user guide, replacing detailed feature-specific sections.
  • Added the Java 21 Maven verification command and information about the test suite’s scope and exclusions.
  • Documented when the Build workflow runs and that it uploads Surefire reports. Clarified that no coverage gate is enforced.

Walkthrough

The README replaces detailed descriptions of train features with project documentation links. It adds instructions for running tests and describes test coverage boundaries and Build workflow reporting.

Changes

README update

Layer / File(s)	Summary
Documentation and test guidance README.md	The README links to project documentation and the user guide. It adds the Java 21 Maven verification command, describes test coverage boundaries, and summarises Build workflow reporting.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to e945b

This is a README-only trim that points readers to the project documentation. It has no runtime impact and is ready to merge, preferably alongside the paired Docs PR.

Architecture Summary

Architecture risk: 🔵 Low · up to 3e745

The change affects 1 system.

Changed systems: README.md

Architecture concerns
No architecture-level concerns identified.

Review details

Systems and components

• observed — README.md (service) was modified; 1 changed file maps to changed impact.

Before / after behavior

• observed — Modified behavior in README.md: Removed the detailed documentation of locomotive overdrive, train movement and track behaviour, including their configuration requirements, limits and persistence details. Replaced it with project documentation links and a user-guide link.
• observed — Modified behavior in README.md: Added test-running instructions using Java 21 and mvn -B --no-transfer-progress clean verify, and described JUnit 5 and Mockito coverage, the absence of live Paper server and ModelEngine testing, Build workflow triggers and Surefire report uploads, and the lack of a coverage gate.

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Actionable comments posted: 1

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Inline comments:
Review comments at @README.md:
- Line 42: Update the Build workflow description in the README to say it runs
the suite on pull requests targeting main and pushes to main; preserve the
existing Surefire report and coverage-gate details.

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• Plan: Advanced
• Run ID: c5ba19f5-258e-4784-9678-a4ea5246850b

📥 Commits

Reviewing files that changed from the base of the PR and between 373a81b and 3e74591.

📒 Files selected for processing (1)

• README.md

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