Setup docs drift: docker-compose and DATABASE_URL missing from README

[ariesadonis]

Setup doc drift found

Running a scan that compares docker-compose.yml against README docs to find gaps that break local setup.

Finding #1 — Services not documented docker-compose.yml defines peppermint and peppermint_postgres services but README has no mention of docker compose up.

Proposed patch — add to Setup section:

docker compose up -d

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Finding #2 — Env var missing .env.example defines DATABASE_URL as local-required but it's missing from README (which documents the older DB_HOST, DB_USERNAME, DB_PASSWORD pattern).

Proposed patch — add to Environment Setup:

• DATABASE_URL

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Confidence: HIGH on both. Happy to open a PR if useful.