[mperor]

• Root README: added Getting Started (JDK 25, running all / one module / one class) and How to Read It (tests as documentation, where to start, what the JavaN headers mean); listed the Common module; the test badge now links to CI runs instead of the JavaReleases test folder.
• FirstSteps & CleanCode: Check it out pointed to the empty Dummy.java — replaced with a categorized table of contents linking every test (Dummy.java itself left untouched).
• DesignPatterns: catalog links now lead to the tests (src/test) instead of the implementations, with a note that the implementation sits in the same package under src/main.
• JavaReleases: each version got a one-line summary of its highlights, based on the class headers and test methods.

All relative links verified to resolve.

[github-actions]

Test Results

258 tests  ±0   255 ✅ ±0   5s ⏱️ ±0s
 77 suites ±0     3 💤 ±0 
 77 files   ±0     0 ❌ ±0 

Results for commit 4285102. ± Comparison against base commit 1b151e0.

This pull request skips 1 and un-skips 1 tests.

pl.mperor.lab.java.design.pattern.creational.singleton.SingletonTest ‑ testThreadSafe()

pl.mperor.lab.java.design.pattern.creational.singleton.SingletonTest ‑ testLazyInitialized()