Add project documentation and Claude instructions

Roadmap, phase specs, pathology catalog, and CLAUDE.md establishing Ledgerline as an observability learning project built on a deliberately imperfect seven-service payments backend.
2026-09-05 08:11:00 +03:30
commit eb99cdbb8c
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+__pycache__/
+*.pyc
+*.pyo
+.pytest_cache/
+.env
+*.egg-info/
+.DS_Store
+venv/
+.venv/