Claude.md is the cheapest architecture you’ll ever write

A good claude.md file does more than “give context”.
It stabilizes decisions, prevents re-explaining, and keeps the AI aligned over time.
Without it, you’re paying in drift and rework on every iteration.

Rule: write context once in a canonical file, and treat it like part of the architecture.

When that context turns into a recurring multi-step workflow, it should graduate into a skill.