docs: add Java 25+ build troubleshooting for Gradle cache issue#393
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Add documentation for users experiencing "Unsupported class file major version 69" error when building with Java 25. The issue occurs when an old Gradle 8.x cache conflicts with the project's Gradle 9.0 wrapper. Changes: - QUICKSTART.md: Add collapsible troubleshooting section with fix - installation.md: Add comprehensive Troubleshooting section including: - Java version compatibility table (Java 22-25+) - Step-by-step fix for clearing old Gradle cache - Additional common issues (JAVA_HOME, slow builds) - Update prerequisites to clarify Java 22-25+ support Fixes #392 Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Add check-java-gradle target that automatically detects when Java 25+ is used with an incompatible Gradle version (< 9.0) and fixes it by: 1. Clearing old Gradle 8.x caches from ~/.gradle/wrapper/dists/ 2. Updating the wrapper to Gradle 9.0 The check runs before build, dev, and ci targets, ensuring users with Java 25+ can build without manual intervention. Generated with [Devin](https://cli.devin.ai/docs) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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Summary
Fixes #392
This PR adds documentation for users experiencing the "Unsupported class file major version 69" error when building with Java 25+.
Root cause: Users may have an old Gradle 8.x version cached from a previous clone or project, but Gradle 8.x doesn't support Java 25 (class file version 69). The project's Gradle 9.0 wrapper supports Java 22-25+.
Changes:
Test plan
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