feat: Build complete market data backend - #5
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Implements the full market data subsystem per MARKET_DATA_DESIGN.md: - `src/market/models.py` — PriceTick dataclass (slots=True) - `src/market/cache.py` — PriceCache (in-memory, asyncio-safe) - `src/market/interface.py` — MarketDataSource ABC - `src/market/simulator_engine.py` — GBM simulator with correlated sectors, Cholesky decomposition, and random events - `src/market/simulator.py` — SimulatorDataSource async wrapper with background tick loop - `src/market/massive.py` — MassiveDataSource REST poller (Polygon.io compatible) - `src/market/factory.py` — create_market_source() factory (env-var driven) - `src/market/sse.py` — SSE endpoint /api/stream/prices - `src/market/__init__.py` — public package exports - `src/main.py` — FastAPI app with lifespan wiring Unit tests (pytest + pytest-asyncio): - test_simulator_engine.py — GBM math, correlation matrix, add/remove tickers, determinism - test_cache.py — PriceCache CRUD operations - test_massive.py — response parsing, HTTP error handling, async start/stop - test_simulator.py — async start/stop, cache population, add/remove tickers - test_factory.py — env-var selection logic - test_sse.py — SSE response shape, event format, field validation Co-authored-by: Musa24 <Musa24@users.noreply.github.com>
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Implements the full market data subsystem per
planning/MARKET_DATA_DESIGN.md:MarketDataSourceinterface (ABC)PriceCachedecoupling write/read frequency/api/stream/pricesMASSIVE_API_KEYCloses #4
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