docs: refresh README and testing guidance

[ryanbarlow97]

Shorten feature descriptions, move goldsmithing finishing rules into Docs and complete test-report 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: a42f735a-8dea-4a6c-b5e9-2fc3a2a17c12

📥 Commits

Reviewing files that changed from the base of the PR and between 67c18a2 and 9791a1d.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Updated the goldsmithing project description to distinguish craftsmanship from material recovery.
  • Added a link to the goldsmithing and finishing rules.
  • Clarified test framework and report locations, CI report uploads, and which checks require in-game testing.

Walkthrough

The README revises the goldsmithing overview, links to goldsmithing and finishing rules, and updates test report details and in-game testing notes.

Changes

README guidance

Layer / File(s)	Summary
Feature and test guidance README.md	The README describes goldsmithing features and separates craftsmanship and material recovery. It adds a link to goldsmithing and finishing rules. The tests section names JUnit 5, lists Surefire and JaCoCo report locations, notes CI uploads both, and identifies checks that require in-game testing.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~4 minutes

Change: Other

Suggested reviewers: xxfran10xx

Merge Risk: ⚪ Minimal · up to 9791a

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

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

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