feat: add compose deliverable, scenario definitions, eval stub, and CI

.env.example

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+# Without this file (or with it empty) the app starts in demo mode:
+# recorded sessions, honestly labeled, no external calls.
+
+APP_MODE=live
+
+# Spotify application (developer dashboard). The redirect URI must be
+# registered on the app and match the compose host port.
+SPOTIFY_CLIENT_ID=
+SPOTIFY_CLIENT_SECRET=
+SPOTIFY_REDIRECT_URI=http://127.0.0.1:8888/callback
+
+# Anthropic API key
+ANTHROPIC_API_KEY=

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  backend:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+      - run: uv sync --frozen
+      - run: uv run ruff check .
+      - run: uv run ruff format --check .
+      - run: uv run mypy app
+      - run: uv run pytest
+
+  frontend:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+      - run: npm ci
+      - run: npm run typecheck
+      - run: npm run lint
+      - run: npm run build

backend/Dockerfile

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+# Build context is the repository root: one image serves API + built SPA.
+FROM node:20-slim AS frontend
+WORKDIR /build
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+RUN npm run build
+
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim
+WORKDIR /srv
+COPY backend/pyproject.toml backend/uv.lock ./
+RUN uv sync --frozen --no-dev --no-install-project
+COPY backend/app ./app
+COPY eval/scenarios.yaml ./eval/scenarios.yaml
+COPY --from=frontend /build/dist ./app/static
+EXPOSE 8000
+CMD ["uv", "run", "--no-sync", "uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]

docker-compose.yml

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+services:
+  app:
+    build:
+      context: .
+      dockerfile: backend/Dockerfile
+    env_file:
+      - path: .env
+        required: false
+    ports:
+      # host port is fixed: the registered Spotify redirect URI
+      # (http://127.0.0.1:8888/callback) must match exactly
+      - "127.0.0.1:8888:8000"

eval/run_eval.py

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+"""Eval harness entry point.
+
+Fixture mode (default, key-free): byte-snapshots of deterministic pipeline
+stages against recorded cassettes. Live mode: property assertions only —
+LLM output is constrained, not pinned.
+"""
+
+from pathlib import Path
+
+import yaml
+
+SCENARIOS_FILE = Path(__file__).parent / "scenarios.yaml"
+
+
+def load_scenarios() -> dict:
+    """Load the shared scenario definitions."""
+    with SCENARIOS_FILE.open() as handle:
+        return yaml.safe_load(handle)
+
+
+if __name__ == "__main__":
+    scenarios = load_scenarios()
+    print(f"{len(scenarios['scenarios'])} scenarios, {len(scenarios['refinements'])} refinements")

eval/scenarios.yaml

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+# One source of truth for three consumers: golden eval queries, demo fixture
+# keys, and UI suggestion chips. Every chip therefore has a fixture, and every
+# fixture has a golden query.
+
+scenarios:
+  - key: focus-coding
+    chip: "Focus while coding"
+    query: "something calm for while I'm programming, but not boring"
+    facets: { activity: coding, familiarity: mixed }
+
+  - key: workout-energy
+    chip: "Energy for the gym"
+    query: "high-energy music for a heavy workout"
+    facets: { activity: workout, mood: energetic }
+
+  - key: dutch-chill
+    chip: "Dutch-language & relaxed"
+    query: "relaxed Dutch-language music for lounging on the couch"
+    facets: { language: nl, mood: relaxed }
+
+  - key: nineties-nostalgia
+    chip: "90s nostalgia"
+    query: "take me back to the nineties"
+    facets: { era: "1990s" }
+
+  - key: discover-new
+    chip: "Surprise me with something new"
+    query: "something I don't know yet but will probably like"
+    facets: { familiarity: new } # asserts known-track exclusion
+
+  - key: rainy-sunday
+    chip: "Rainy Sunday"
+    query: "melancholic but warm, for a rainy Sunday morning"
+    facets: { mood: melancholic }
+
+  - key: dinner-background
+    chip: "Background for dinner"
+    query: "something jazzy for during dinner, not too present"
+    facets: { mood: understated }
+
+# Multi-turn refinement goldens: reuse the grounded pool, no re-grounding.
+refinements:
+  - key: focus-coding-refine
+    after: focus-coding
+    query: "a bit more electronic, and drop number 3"