docs: add TODO.md with project checklist and roadmap

TODO.md

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+# idx-cli TODO
+
+## ✅ Completed (v0.1.0)
+- [x] Provider abstraction (MarketDataProvider trait, Yahoo impl)
+- [x] `stocks quote <SYMBOL...>` — real-time quotes, multi-symbol
+- [x] `stocks history <SYMBOL>` — historical OHLC data
+- [x] File cache with TTL + offline mode + stale-cache fallback
+- [x] Config system (TOML file, env vars, CLI flags, precedence)
+- [x] Output modes: table (human) + JSON (agent)
+- [x] 52-week range bar in quote table
+- [x] `cache info` / `cache clear`
+- [x] `config init` / `get` / `set` / `path`
+- [x] Pre-commit hooks (fmt, clippy, test)
+- [x] GitHub Actions CI
+- [x] Nix flake + devshell
+- [x] MIT license
+- [x] crates.io metadata
+
+## ✅ Completed (v0.1.1)
+- [x] Technical analysis module (SMA, EMA, RSI, MACD, volume ratio)
+- [x] Signal interpretation (bullish/bearish/neutral consensus)
+- [x] `stocks technical <SYMBOL>` — full technical analysis command
+- [x] Colored signal output (green/red/yellow)
+- [x] 1-year lookback for SMA200 coverage
+
+## 🚧 Next Up
+- [ ] `stocks fundamental <SYMBOL>` — composite growth + valuation + risk
+- [ ] `stocks growth <SYMBOL>` — revenue/earnings growth YoY
+- [ ] `stocks valuation <SYMBOL>` — PE, PB, ROE, margins, EV/EBITDA
+- [ ] `stocks risk <SYMBOL>` — D/E ratio, current ratio, ROA
+- [ ] `stocks compare <SYM1,SYM2,...>` — side-by-side multi-symbol comparison
+- [ ] `analysis/fundamental.rs` — fundamental analysis module
+
+## 📋 Backlog (per SPEC.md)
+- [ ] `market summary` — IHSG index, market breadth
+- [ ] `market movers` — top gainers/losers/volume
+- [ ] `market sectors` — sector performance overview
+- [ ] `screen query "<EXPR>"` — filter stocks by expression
+- [ ] `screen presets` / `screen run <PRESET>` — built-in screener presets
+- [ ] `watchlist` commands — create, manage, live watch
+- [ ] `alerts` system (v0.2+) — price alerts with daemon
+- [ ] `completions <SHELL>` — shell completion generation
+- [ ] CSV/TSV output formats
+- [ ] Additional providers (Alpha Vantage, Twelve Data, IDX official)
+
+## 🐛 Known Issues
+- [ ] Yahoo Finance returns 429 from datacenter IPs occasionally
+- [ ] SMA200 trend shows "Insufficient data" if Yahoo returns < 200 candles