docs: add PROJECT.md with backlog (retry/backoff for ICE + yfinance)

PROJECT.md

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+# BeanFlows Project Tracker
+
+## In Progress
+
+_nothing active right now_
+
+## Next Up
+
+- **Retry/backoff for ICE and yfinance extractors** — Add a 3-attempt exponential backoff wrapper (30s/60s/120s) to `extract/ice_stocks/` and `extract/coffee_prices/`. These are the two sources most exposed to transient rate-limiting (ICE commercial exchange, Yahoo Finance IP throttling). No proxies needed unless active blocking is observed. Government sources (USDA, CFTC) and Open-Meteo don't need this.
+
+## Backlog
+
+- Expand to additional commodities beyond coffee (cocoa, sugar, cotton — all on ICE US; COT + warehouse + prices already modelled generically)
+- WASDE report integration (USDA monthly supply/demand estimates, official balance sheet)
+- FAO trade statistics (export flow by origin country pair)
+- FRED macro overlay (USD index, interest rates) on price chart
+- Options positioning — Barchart API or CBOE put/call ratios
+
+## Done
+
+- USDA PSD Online extractor + SQLMesh pipeline (supply/demand, stock-to-use)
+- CFTC COT disaggregated futures-only extractor + foundation + serving models
+- CFTC COT combined (futures+options) extractor + foundation union + serving model + web toggle
+- KC=F daily price extractor (yfinance) + SQLMesh pipeline
+- ICE certified warehouse stocks — daily rolling, aging by port, historical by port
+- Open-Meteo ERA5 weather extractor — 12 coffee-growing regions, daily
+- Dashboard pages: Pulse, Supply, Positioning (with F+O toggle), Warehouse, Weather, Origins
+- REST API v1: commodities, pricing, positioning (?type=fut|combined), stocks, weather
+- Chart.js resize fix — global htmx:beforeSwap chart destroy + requestAnimationFrame resize on all pages