docs(FIN-WP-0002): propose fabric authority boundary

Parent prj-state-hub-retirement SHR-WP-0001 stream S7.

workplans/FIN-WP-0002-fabric-authority-boundary.md

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+---
+id: FIN-WP-0002
+type: workplan
+title: "Fabric authority boundary for State Hub retirement"
+domain: financials
+repo: fin-hub
+status: proposed
+owner: codex
+topic_slug: financials
+created: "2026-08-09"
+updated: "2026-08-09"
+parent_project: prj-state-hub-retirement
+parent_workplan: SHR-WP-0001
+related:
+  - FIN-WP-0001
+  - SHR-INV-0001
+  - STATE-WP-0079
+---
+
+# Fabric authority boundary for State Hub retirement
+
+## Goal
+
+Keep **fabric graph data authority** in fin-hub (or its specialized engine),
+define any hub-core projection, and support State Hub fabric route disposition
+(`move` → fin-hub).
+
+## Confirm authority and APIs
+
+```task
+id: FIN-WP-0002-T01
+status: todo
+priority: high
+```
+
+Document which fabric entities/APIs are authoritative here vs State Hub read
+models; publish consumer contract for migration.
+
+## Migration path from State Hub fabric routes
+
+```task
+id: FIN-WP-0002-T02
+status: todo
+priority: high
+```
+
+With STATE-WP-0079, plan cutover for fabric ingest/read routes and dashboard
+consumers; row-count and provenance checks.
+
+## Optional hub projection
+
+```task
+id: FIN-WP-0002-T03
+status: todo
+priority: low
+```
+
+If orientation needs a hub-core projection, define port usage without copying
+authority tables into hub-core.
+
+## Acceptance
+
+- [ ] Authority boundary documented
+- [ ] Migration path agreed with State Hub strangler
+- [ ] Projection decision recorded (implement or explicitly defer)