loader/.cursor/skills/plan/steps/00_prerequisites.md

Prerequisite Checks (BLOCKING)

Run sequentially before any planning step:

Prereq 1: Data Gate

1. _docs/00_problem/acceptance_criteria.md exists and is non-empty — STOP if missing
2. _docs/00_problem/restrictions.md exists and is non-empty — STOP if missing
3. _docs/00_problem/input_data/ exists and contains at least one data file — STOP if missing
4. _docs/00_problem/problem.md exists and is non-empty — STOP if missing

All four are mandatory. If any is missing or empty, STOP and ask the user to provide them. If the user cannot provide the required data, planning cannot proceed — just stop.

Prereq 2: Finalize Solution Draft

Only runs after the Data Gate passes:

1. Scan _docs/01_solution/ for files matching solution_draft*.md
2. Identify the highest-numbered draft (e.g. solution_draft06.md)
3. Rename it to _docs/01_solution/solution.md
4. If solution.md already exists, ask the user whether to overwrite or keep existing
5. Verify solution.md is non-empty — STOP if missing or empty

Prereq 3: Workspace Setup

1. Create DOCUMENT_DIR if it does not exist
2. If DOCUMENT_DIR already contains artifacts, ask user: resume from last checkpoint or start fresh?