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SSM DA: state vector uses total SWC (liquid + ice), observations measure liquid only #53

Description

@visakhraja

Problem

The soil moisture state vector uses h2osoi_vol_col (volumetric total SWC)
'swc_total = h2osoi_liq/(dzdenh2o) + h2osoi_ice/(dzdenice)'

However, typical soil moisture observations respond only to liquid water.

Issue:

-- The model presents total SWC (liquid + ice) to the observation operator
-- The observation sees only liquid SWC

Suggested fix

-- Use liquid-only SWC in the state vector and update only h2osoi_liq, leaving h2osoi_ice completely untouched
-- A temperature mask should additionally be applied to skip deeply frozen layers where even liquid-water observations are unreliable.

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