add-contest-table-provider

name	add-contest-table-provider
description	Add a new ContestType and ContestTableProvider across 5 layers using TDD. Covers all 3 patterns. Asks targeted questions to gather pattern-specific requirements before touching code.
argument-hint	<ContestType> <contest_id>

Add a new contest table provider for: $ARGUMENTS

When in doubt at any step, use AskUserQuestion before proceeding.

0. Seed check — grep prisma/tasks.ts for the contest_id(s); report count + task_ids; if absent or incomplete, ask the user to add missing rows (reference: https://kenkoooo.com/atcoder/resources/problems.json)
1. Gather requirements — infer the implementation pattern; confirm per instructions.md §Requirements
2. Implement — follow instructions.md for the confirmed pattern across 5 layers (TDD)