Add jep513 module: flexible constructor bodies on JDK 25 and 27

Runnable sources, broken examples and captured transcripts for the ankurm.com JEP 513 article, including the JDK 25 vs 27 compiler wording differences.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
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Claude
2026-09-24 10:42:36 +00:00
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$ javac src/BeforeJava25.java && java BeforeJava25 (OpenJDK Runtime Environment Temurin-25.0.4.1+1 (build 25.0.4.1+1-LTS))
Person constructor ran for 'Asha'
name='Asha' salary=50000
caught: salary must be >= 0, got -1
$ javac src/BeforeJava25.java && java BeforeJava25 (OpenJDK Runtime Environment (build 21.0.10+7-Ubuntu-124.04))
Person constructor ran for 'Asha'
name='Asha' salary=50000
caught: salary must be >= 0, got -1