docs: add README for every subdirectory

33 agent READMEs, 14 hand READMEs, 2 plugin READMEs
(echo-memory + hooks), and 2 skill READMEs
(custom-skill-prompt + custom-skill-python).

Each README documents the component's purpose, configuration,
and usage based on its TOML definition.

hands/trader/README.md

@@ -0,0 +1,34 @@
+# Trading Hand
+
+Autonomous market intelligence and trading engine -- multi-signal analysis, adversarial bull/bear reasoning, calibrated confidence scoring, strict risk management, and portfolio-level analytics.
+
+## Configuration
+
+| Field | Value |
+|-------|-------|
+| Category | `data` |
+| Agent | `trader-hand` |
+| Routing | `trade`, `portfolio`, `market analysis`, `paper trade`, `stock trading` |
+
+## Integrations
+
+None required. Alpaca API keys needed for live trading mode.
+
+## Settings
+
+- **Trading Mode** -- `analysis` (signals only), `paper` (simulated), `live` (real via Alpaca)
+- **Market Focus** -- `us_stocks`, `crypto`, `multi_asset`
+- **Strategy Style** -- `scalping`, `day`, `swing`, `position`
+- **Risk Per Trade** -- `1%`, `2%`, `3%`, `5%` of portfolio
+- **Max Daily Loss** -- `2%`, `5%`, `10%` circuit breaker threshold
+- **Analysis Depth** -- `quick`, `standard`, `deep`
+- **Scan Schedule** -- `15m`, `1h`, `4h`, `daily`
+- **Watchlist** -- Comma-separated tickers (default: `SPY,QQQ,AAPL,MSFT,NVDA,BTC,ETH`)
+- **Initial Capital** -- Starting portfolio value (default: `$10,000`)
+- **Approval Mode** -- Require approval before live trades (default: on)
+
+## Usage
+
+```bash
+librefang hand run trader
+```