docs(qc): Batch 6 - HandsOn AI Trading 19/19 examples complete

[jsboige]

Summary

• Complete mapping of all 19 Applied ML examples from Hands-On AI Trading book (Section 06)
• Update HANDSON_AI_TRADING_MAPPING.md with ✅ status and backtest metrics for Ex05/06/07/08/14/17/18
• Add 4 new project entries to the Projects table (Positive-Negative-Splits-ML, Stoploss-Volatility-ML, Dividend-Harvesting-ML, ML-HeadShoulders-CNN)
• Fix set_holdings overload in SVM-Wavelet-Forecasting main.py

Backtest Results (QC Cloud)

Example	Sharpe	CAGR	Net Profit	MaxDD
Ex05 SVM Wavelet	0.167	5.07%	28.1%	20.5%
Ex07 Splits ML	1.736	90.8%	2883.7%	42.4%
Ex14 Temporal CNN	0.734	20.51%	154.1%	21.6%
Ex17 HeadShoulders CNN	-46.8	0.03%	0.15%	0.1%
Ex18 Chronos Foundation	0.277	7.23%	63.0%	13.5%

Test plan

• All 5 examples have working code with main.py
• All backtested on QC Cloud successfully
• MAPPING file rows updated with correct project paths
• Projects table updated with new entries

Closes #143

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