feat(farming-analyzer)!: add modular farming analyzer

[zoeyrose]

Summary

• add the source-derived Classic farming analyzer under farming_analyzer/
• split parsing, XP, treasure, models, analysis, presentation, and CLI responsibilities into focused modules
• use the shared content@main checkout instead of the retired content-1x checkout
• keep the package executable with python3 -m tools.farming_analyzer and retain the supplied regression coverage
• document runtime requirements, source inputs, modeling assumptions, and usage

Validation

• python3 -m unittest discover -v (36 tests)
• python3 -m compileall -q -f farming_analyzer stacktrace.py tests
• representative packaged CLI scan completed against content@main
• git diff --check