docs: refresh README and testing guidance

[ryanbarlow97]

Move detailed gameplay instructions into Docs and complete test guidance.

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: 5223f43a-2551-4e78-9305-1384777e40e0

📥 Commits

Reviewing files that changed from the base of the PR and between 703e56a and 5d6a373.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified that incorrect materials or tool actions are accepted, but only the correct recipe produces furniture; a wrong mix ruins the project.
  • Clarified that cancelling unfinished work returns the materials.
  • Updated the coverage information to note that build CI uploads Surefire test results.

Walkthrough

The README now summarises workbench outcomes for incorrect inputs, incorrect recipes and cancelled work. It also states that build CI uploads Surefire test results.

Changes

README updates

Layer / File(s)	Summary
Update workbench and coverage descriptions README.md	The workbench description now summarises the outcomes of incorrect inputs, incorrect recipes and cancellations. The coverage section states that Surefire test results are uploaded by build CI.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: xxfran10xx

Merge Risk: ⚪ Minimal · up to 5d6a3

No actionable merge-blocking risk is established in these README updates.

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

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