git: openjdk/babylon: code-reflection: Added TLDR build+run instructions to README and simplified hat.java

[Gary Frost]

Changeset: 3db08a3e
Branch: code-reflection
Author:    Gary Frost <gfrost at openjdk.org>
Date:      2025-10-31 10:26:03 +0000
URL:       https://git.openjdk.org/babylon/commit/3db08a3e9cfe71dba1409580c4c04c8744f98af8

Added TLDR  build+run instructions to README and simplified hat.java

! hat/README.md
! hat/hat.java
! hat/hat/job.jar
! hat/hat/job/src/main/java/job/Project.java