- Update all Ghidra JAR dependencies to 11.4.2
- Improve TransactionHelper to properly handle endTransaction return value
- Add GHIDRA_HOME environment variable support for flexible builds
- Update version references in extension.properties and MANIFEST.MF
The transaction fix now checks the return value from endTransaction() and
properly reports transaction failures, providing better error handling for
Ghidra 11.3.2+ compatibility.
Refs #7
