[backend] Implement rules engine and scoring

Repo: · Issue: #980 Status: Open · Priority: P2 Assignee: Unassigned

Description

Summary

Add deterministic rule evaluation and NBA scoring, with AI-assisted ranking.

Scope

• Rules module with condition operators over merchant context/signals
• Scoring module combining rule matches and AI suggestions
• Persist scores/confidence and rationale

Role

Backend/AI

Estimate

4–6 days

Implementation Notes

Dash adds notes here while working

Related

Link to people, meetings, dependent tickets