Adjust net deposit baseline for CAGR start

[dbigham]

Summary

• derive the baseline equity from the day before the CAGR start when computing net deposits
• fall back to start-of-period equity if no prior data exists and update per-currency totals accordingly
• add a regression test that covers the adjusted CAGR baseline handling

Testing

• npm test -- --test test/totalPnlSeries.test.js

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https://chatgpt.com/codex/tasks/task_e_68ebbc889bc0832dacb91ab5736fd7f3

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Avoid double counting baseline equity in per-currency totals

When computeNetDeposits adjusts for a CAGR start date it now adds baselineEquity to result.netDeposits.perCurrency.CAD. The per-currency map produced by computeNetDepositsCore already reflects the full CAD funding history (no CAGR pruning), so after combinedCad is increased by the baseline the CAD entry already matches that total. Adding the baseline again inflates the CAD amount by the start-of-period equity and makes per-currency totals no longer align with combinedCad, yielding overstated CAD deposits whenever the adjustment runs. The CAD entry should either be left unchanged or reduced by pre-start flows instead of adding the baseline a second time.

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