docs: refresh README roadmap (SP4/6/7 shipped, add Next up) + commit SP6 plan

- Mark SP4 as fully shipped (batch diff, search, CSV, a11y all landed)
- Add SP6 (Inbox) and SP7 (Per-line reconciliation) sections
- Add SP6 + SP7 endpoint inventories
- Note next up: outbound 837P serializer

The workflow-automation plan was authored but never committed; the
features it specified have shipped, so commit it for the historical
record alongside this README refresh.
This commit is contained in:
Tyler
2026-06-20 19:58:26 -06:00
parent ceeb8b664d
commit 27c1680830
2 changed files with 2796 additions and 14 deletions
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