model/provider/contextWindow now join the served snapshot by conditional
spread: an unknown value leaves the key ABSENT instead of materializing an
`undefined`-valued property. The harness's lossless-JSON pipeline rejects
such a view whole — on 0.1.2 that fails every projection push for the
session (the fresh-blank-session breakage reported in #29/#30; the same
property discipline the persisted state has held since stateVersion 10).
Guarded by plain-JSON view assertions over both the unknown and the known
model shapes.
bowenliang123
d25d44aff1