docs: trim the README tests section and admin credits feature

[ryanbarlow97]

Summary

• Trim Tests and coverage to the run command, tools, JaCoCo report location, the enforced 100% line/branch/instruction gate, the POSIX permissions note and the live-server limit. Drop the list of individual regression cases. Account save durability and storage failure handling move to Docs.
• Shorten the Admin credits feature to a description. The /deco give syntax and denareconomy.give permission are documented in Docs.

Paired Docs PR: TF-Minecraft/Docs#96. Merge the Docs PR first or together with this one.

Checks

• README order: intro, Features, Documentation, Tests and coverage, License.
• Gate and artifact wording match pom.xml and .github/workflows/build.yml.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Clarified that staff can credit online or offline players’ bank or pouch balances.
  • Updated testing guidance to identify JUnit, JaCoCo coverage reports and CI artifacts, and explain that verify enforces full line, branch and instruction coverage.
  • Added information about POSIX filesystem permission requirements and the limitations of simulated Bukkit testing.
  • Removed earlier details about database-path isolation, specific test scenarios, and account persistence and recovery behaviour.

Walkthrough

The README updates the admin-credit description and test documentation. The test documentation adds JUnit, JaCoCo report files, a CI artifact name pattern, coverage enforcement, and POSIX permission requirements.

Changes

README documentation

Layer / File(s)	Summary
Admin-credit and test documentation README.md	The admin-credit description states that staff can credit online or offline players’ bank or pouch balances. The test documentation lists JUnit, JaCoCo report files, the CI artifact naming pattern, 100% line, branch, and instruction coverage enforcement, and POSIX permission requirements.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to b8fd1

The shortened README accurately describes the documented feature and test setup; no actionable issue remains before merge.

Architecture Summary

Architecture risk: 🔵 Low · up to 2799a

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: The admin-credit description no longer specifies the /deco give command, console or operator access, or the denareconomy.give permission; it describes staff crediting a player's bank or pouch, online or offline.
• observed — Modified behavior in README.md: The test documentation adds the test frameworks, JaCoCo output files and CI artifact, coverage enforcement, and filesystem permission requirements. It removes descriptions of specific regression and fault-injection tests, database-path isolation, and persistence and shutdown behaviour.

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Actionable comments posted: 1

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Inline comments:
Review comments at @README.md:
- Line 37: Update the README reference to the uploaded coverage artifact to use
the `coverage-report-*` name pattern instead of the exact `coverage-report`
name, matching the workflow’s run ID and attempt suffix.

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📒 Files selected for processing (1)

• README.md

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