Bootstrap fin-hub scaffold from hub-core (CUST-WP-0025-T22/T23)

Add hub-core editable dependency, fin-specific SQLAlchemy models, and smoke tests.

README.md

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+# Fin Hub
+
+Resource viability hub for the FOS federation — budgets, commitments, burn rate,
+runway projection, and token spend tracking.
+
+Fin-hub extends `hub-core` with financial models and read surfaces. Generic hub
+primitives (domains, repos, messages, progress events) come from hub-core;
+fin-specific models (budget, commitment, burn rate, runway, token spend) live
+here.
+
+## Status
+
+Bootstrap scaffold (`CUST-WP-0025-T22`). Models and ingestion pipelines are
+tracked in `CUST-WP-0025-T23`–`T24`.
+
+## Quick Start
+
+```bash
+cd /home/worsch/fin-hub
+uv sync
+uv run pytest
+```
+
+## Related Workplans
+
+- `the-custodian/workplans/CUST-WP-0025-fos-hub-bootstrap.md` — umbrella
+- `canon/constitution/bootstrap-protocol_v0.1.md` — funding and roles
+- `canon/projects/railiance/business-model-canvas_v0.1.md` — monetization path