chore: major repo cleanup - remove dead code and cruft
Remove ~24K lines of dead code for a lean rebuild foundation:
- Remove atomizer-field/ (neural field predictor experiment, concept archived in docs)
- Remove generated_extractors/, generated_hooks/ (legacy generator outputs)
- Remove optimization_validation/ (empty skeleton)
- Remove reports/ (superseded by optimization_engine/reporting/)
- Remove root-level stale files: DEVELOPMENT.md, INSTALL_INSTRUCTIONS.md,
config.py, atomizer_paths.py, optimization_config.json, train_neural.bat,
generate_training_data.py, run_training_fea.py, migrate_imports.py
- Update .gitignore for introspection caches and insight outputs
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Anto01
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