New panel 16 (barchart, h=11, y=179): one stacked bar per tax year showing
total comp split into net pay (bank deposit), cash income tax, RSU tax
(band-aware marginal: PAYE+NI), cash NI, student loan, pension salary-
sacrifice, and RSU offset (Variant A only).
X-axis = tax_year (categorical), y-axis = currencyGBP. Bar height ≈
gross_pay + pension_sacrifice (small over-attribution in Variant A years
where the band-aware model exceeds recorded payslip PAYE).
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