Bug: priority field type mismatch between entry types and DB column
Problem
The `priority` DB column is defined as `Integer` in `pyrite/storage/models.py`, but entry types like `BacklogItemEntry` use string values ("high", "medium", "low"). The Prioritizable protocol in ADR-0017 defines priority as an integer (1-5 scale).
This mismatch means:
Options
1. Change DB column to Text — simple, but loses ability to do numeric comparison 2. Map strings to integers during indexing: high=1, medium=3, low=5 — preserves schema intent 3. Change protocol to use string priorities — matches how humans think about priority