v0.1.23.3 minor updates

What's Changed

• Add Docker quick start guide to README by @amavashev in #14
• Add CI workflow for automated testing on main branch by @amavashev in #15
• Add JaCoCo coverage enforcement with 50% line threshold by @amavashev in #16
• Raise JaCoCo threshold to 90% and add comprehensive test coverage by @amavashev in #17
• Add comprehensive audit documentation for v0.1.23 by @amavashev in #18
• Update ErrorCode audit documentation to reflect 23 total values by @amavashev in #19
• Implement CI-friendly Maven versioning with flatten-maven-plugin by @amavashev in #20
• Add .flattened-pom.xml to .gitignore by @amavashev in #21
• Add session start hook and CLAUDE.md for Maven proxy setup by @amavashev in #22

Full Changelog: v0.1.23...v0.1.23.3