🌟 Nova: Tax Loss Harvester

[madmax983]

💡 The Spark: We have detailed forecasting for assets and RSUs, but we don't have anything related to automated tax loss harvesting tracking.
🚀 The Feature: Implemented TaxLossHarvester to identify harvestable losses from a list of tax lots given a current market price.
🔮 The Potential: Enables the CLI to eventually show users actionable tax alpha (e.g., "You have $3,000 in harvestable tax losses this year").
⚠️ Risk: Low. Isolated in src/experimental/tax_loss_harvester.rs and gated behind the nova feature flag.

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PR created automatically by Jules for task 12092640762238809686 started by @madmax983

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