Add 837P parser implementation plan

- 12 tasks: project skeleton, exceptions, segments, models, payer config,
  fixtures, validator, parser orchestrator, CO fixture, writer, CLI, README
- TDD throughout; each task has 4-6 bite-sized steps with full code
- Optional prodfile smoke test (skipped if docs/prodfiles absent)
- Self-review checklist confirms full spec coverage
This commit is contained in:
Cyclone
2026-06-19 15:12:04 -06:00
parent d9dc8a86bd
commit 5ed59ef01a
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