feat: Oracle and Sentinel Hands (Phase 4)

Add the first two autonomous Hands to validate infrastructure:

Oracle Hand (hands/oracle/):
- Bitcoin intelligence briefing, 2x daily (7am, 7pm)
- Monitors: price action, on-chain metrics, macro context
- Tools: mempool_fetch, fee_estimate, price_fetch, whale_alert
- Output: Dashboard + Telegram, markdown format
- Safety: Broadcast requires approval (5min auto)

Sentinel Hand (hands/sentinel/):
- System health monitoring, every 15 minutes
- Monitors: dashboard, agents, database, disk, memory
- Tools: system_stats, db_health, agent_status, disk_check
- Output: Dashboard + Telegram, JSON format
- Safety: Service restart requires approval (1min auto)

Both include:
- HAND.toml configuration with schedules
- SYSTEM.md with complete prompts
- skills/ directory with specialized knowledge
- Approval gates for write actions

hands/oracle/skills/technical_analysis.md

@@ -0,0 +1,20 @@
+# Technical Analysis Skills
+
+## Support/Resistance Identification
+
+1. **Recent swing highs/lows** — Last 30 days
+2. **Volume profile** — High volume nodes = support/resistance
+3. **Moving averages** — 20D, 50D, 200D as dynamic S/R
+4. **Psychological levels** — Round numbers (40K, 50K, etc.)
+
+## Trend Analysis
+
+- **Higher highs + higher lows** = uptrend
+- **Lower highs + lower lows** = downtrend
+- **Compression** = volatility expansion incoming
+
+## Momentum Signals
+
+- RSI > 70 = overbought (not necessarily sell)
+- RSI < 30 = oversold (not necessarily buy)
+- Divergence = price and RSI disagree (reversal warning)