docs: refresh README and testing guidance

[ryanbarlow97]

Shorten detailed feature and configuration manuals into linked Docs guides and clarify current testing.

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: 5e9fb40a-0d7f-449a-acb1-c5cabc6f1cea

📥 Commits

Reviewing files that changed from the base of the PR and between 2b619c3 and 3418e66.

📒 Files selected for processing (1)

• README.md

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Condensed and regrouped the feature descriptions in the README.
  • Clarified test setup, coverage rules, report locations and the limits of what the tests establish.

Walkthrough

The README now groups its feature descriptions and updates its test instructions with test tools, JaCoCo coverage rules, report locations, and test scope.

Changes

README updates

Layer / File(s)	Summary
Grouped feature descriptions README.md	The Features list now summarises character identity, classes, progression, focus, injuries, combat, and Codex information.
Test and coverage instructions README.md	The instructions name the test tools, describe JaCoCo coverage rules, identify report locations, and state what the tests do not establish.

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: xxfran10xx

Merge Risk: ⚪ Minimal · up to 3418e

The README changes present no identified merge-blocking risk.

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

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