feat: implement Volatility Hunter for real-time market scanning

Implements issue #20 - Behavioral Rule: Volatility Hunter

Components:
1. src/analysis/volatility.py
   - VolatilityAnalyzer with ATR calculation
   - Price change tracking (1m, 5m, 15m intervals)
   - Volume surge detection (ratio vs average)
   - Price-volume divergence analysis
   - Momentum scoring (0-100 scale)
   - Breakout/breakdown detection

2. src/analysis/scanner.py
   - MarketScanner for real-time stock scanning
   - Scans all available stocks every 60 seconds
   - Ranks by momentum score
   - Identifies top 5 movers per market
   - Dynamic watchlist updates

3. Integration with src/main.py
   - Auto-adjust WATCHLISTS dynamically
   - Replace laggards with leaders (max 2 per scan)
   - Volume confirmation required
   - Integrated with Context Tree L7 (real-time layer)

4. Comprehensive tests
   - 22 tests in tests/test_volatility.py
   - 99% coverage for analysis module
   - Tests for all volatility calculations
   - Tests for scanner ranking and watchlist updates
   - All tests passing

Key Features:
- Scan ALL stocks, not just current watchlist
- Dynamic watchlist that adapts to market leaders
- Context Tree integration for real-time data storage
- Breakout detection with volume confirmation
- Multi-timeframe momentum analysis

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/analysis/__init__.py

@@ -0,0 +1,8 @@
+"""Technical analysis and market scanning modules."""
+
+from __future__ import annotations
+
+from src.analysis.scanner import MarketScanner
+from src.analysis.volatility import VolatilityAnalyzer
+
+__all__ = ["VolatilityAnalyzer", "MarketScanner"]