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Add four Russian-language project documents: - README.md: user-facing guide (install, quick start, data prep, training, evaluation, limitations) - docs/architecture.md v1.0: system architecture, data flow diagrams, module interfaces, 7 architectural decision records, extension points - docs/glossary.md v1.0: musical, ML, and project-specific term definitions - docs/requirements.md v1.0: functional/non-functional requirements, acceptance criteria, four use-case scenarios Update CLAUDE.md with project name etymology (hamori / ハモリ) and rename repo root reference from chord-gen to hamori. Refine chord_format_spec.md. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>