feat(backend): scaffold cyclone package skeleton

backend/.gitignore

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+__pycache__/
+*.py[cod]
+*.egg-info/
+.pytest_cache/
+.ruff_cache/
+.venv/
+venv/
+build/
+dist/

backend/pyproject.toml

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+[build-system]
+requires = ["setuptools>=68", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "cyclone"
+version = "0.1.0"
+description = "Cyclone EDI suite — X12 837P/835 parser"
+requires-python = ">=3.11"
+dependencies = [
+    "pydantic>=2.6,<3",
+    "click>=8.1,<9",
+]
+
+[project.optional-dependencies]
+dev = [
+    "pytest>=8.0",
+    "pytest-cov>=4.1",
+]
+
+[project.scripts]
+cyclone = "cyclone.cli:main"
+
+[tool.setuptools.packages.find]
+where = ["src"]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+addopts = "-ra --strict-markers"

backend/src/cyclone/__init__.py

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+__version__ = "0.1.0"

backend/src/cyclone/__main__.py

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+from cyclone.cli import main
+
+if __name__ == "__main__":
+    main()

backend/src/cyclone/parsers/__init__.py

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+"""Public re-exports for the 837P parser."""
+
+from cyclone.parsers.exceptions import CycloneParseError, CycloneValidationError
+from cyclone.parsers.models import (
+    Address,
+    BatchSummary,
+    BillingProvider,
+    ClaimHeader,
+    ClaimOutput,
+    Diagnosis,
+    Envelope,
+    ParseResult,
+    Payer,
+    Procedure,
+    ServiceLine,
+    Subscriber,
+    ValidationIssue,
+    ValidationReport,
+)
+from cyclone.parsers.payer import PayerConfig
+from cyclone.parsers.segments import Delimiters, tokenize
+from cyclone.parsers.parse_837 import parse
+
+__all__ = [
+    "Address",
+    "BatchSummary",
+    "BillingProvider",
+    "ClaimHeader",
+    "ClaimOutput",
+    "CycloneParseError",
+    "CycloneValidationError",
+    "Delimiters",
+    "Diagnosis",
+    "Envelope",
+    "ParseResult",
+    "Payer",
+    "PayerConfig",
+    "Procedure",
+    "ServiceLine",
+    "Subscriber",
+    "ValidationIssue",
+    "ValidationReport",
+    "parse",
+    "tokenize",
+]