Clean clone to green gate

This page is the real, literal path from a fresh clone to a passing gate — no steps skipped, no commands invented beyond what's in CLAUDE.md and scripts/gate.mjs.

Prerequisites

• Node 24

• pnpm 11

• Docker (for the local PostgreSQL instance, via Compose)

  Runtime support policy (standing rule, CLAUDE.md "Runtime support policy"): runtimes ship only on Active LTS lines — Node 24 today. The next Current line (Node 26) runs as a non-blocking CI evidence job (gate-node-next in ci.yml) and is adopted only once it reaches LTS; Maintenance LTS is the floor engines may accept.

• ffmpeg on your PATH (or LOOMBRE_FFMPEG pointing at a binary). Without it, several worker test suites (probe/session/subtitle/battery integration) silently skip rather than fail, so a clean-looking local pnpm test/pnpm gate run can hide real coverage gaps. Set LOOMBRE_REQUIRE_FFMPEG=1 to turn that silent skip into a hard failure — LOOMBRE_REQUIRE_FFMPEG=1 pnpm gate:full is exactly what CI runs, so it's the closest local match to what a PR is actually checked against.

1. Install dependencies

pnpm install

2. Bring up the database and set it up

docker compose -f docker-compose.dev.yml up -d
pnpm db:migrate
pnpm db:seed

The first command brings up PostgreSQL (host port 5442) and Adminer (a web-based database browser, host port 8080) via docker-compose.dev.yml, detached so this terminal is free again immediately. db:migrate applies every migration in packages/db. db:seed loads a small, deterministic dataset so the app has something to browse. (There's also pnpm db:reset, if you need to drop and recreate the schema from scratch — and a separate db:seed-large target used by the performance harness, not needed for everyday development.)

3. Start the dev environment

pnpm dev

pnpm dev re-runs the same docker compose up -d from step 2 (a harmless no-op if it's already running) and then starts the server, worker, and web client in watch mode via Turborepo. pnpm dev stays running — it's not a one-shot setup step, it's your dev environment for the rest of this session — so open a second terminal for everything below.

Once it's up:

What	Where
Web client	http://localhost:3000
API server	http://localhost:3001
Adminer (database browser)	http://localhost:8080
PostgreSQL	localhost:5442

4. Run the tests

(From the second terminal.)

pnpm test

Runs every workspace package's test suite via Turborepo. If you're working specifically on playback decision logic:

pnpm test:matrix

Runs only the playback-engine's offline test matrix — see Playback engine & matrix law for what that actually is, and Authoring a matrix case if you're adding to it.

5. Run the gate

pnpm gate

This is the fast inner-loop default, stopping at the first failing step: codegen → sdk-drift → oasdiff → depcruise → runtime-imports → license-check → dep-audit → lint → typecheck → test → db:migrate-check → grep-gates → docs-build (see scripts/gate.mjs for the exact step list and the reasoning behind each step's position — it's a short, heavily-commented file, worth reading once).

5a. Before you push or open a PR: run the full gate

pnpm gate:full

pnpm gate:full runs everything pnpm gate runs, plus a 14th step, web-build-budget: a production build of apps/web and a check of its bundle size against the docs/PLAN.md §9.3 budget. This step is genuinely slow (a full Next.js production build), which is why it's not in the fast pnpm gate — but CI runs pnpm gate:full, not the fast gate, so a green pnpm gate alone does not guarantee a green PR. Run LOOMBRE_REQUIRE_FFMPEG=1 pnpm gate:full (see "Prerequisites" above) for the closest local match to what CI itself enforces.

Where to go next

• Making a contract change (a new or modified endpoint)? See Contract-first workflow.
• Touching playback decisions? See Playback engine & matrix law.
• Not sure what a term in this guide means? Check the Glossary.
• CONTRIBUTING.md at the repository root has the PR-level expectations (feedback-loop-first, the matrix regression law, contract-first rules) distilled into one page.