VS11 validation

Package callback, icon, module import, form event and busy-guard checks passed.
Independent search reference checks passed: exact integer product mix, continuous
formulation with three seeds, nonlinear objective and deliberately infeasible case.
Product mix: A=20, B=40, contribution 2000; full grid has 2091 candidates plus
the initial evaluation. Continuous formulation: about .3/.2/.5 at cost 14/kg;
small deviations within 1e-6 constraint tolerance are permitted.
Both worked workbooks recalculated and checked against analytic references.
Changed-input propagation was checked and starting values restored. All six
worksheets were rendered and visually inspected; no formula errors were found.
Existing sensitivity and tree reference examples passed retained checks.

NOT TESTED: Windows Excel/VBA compilation, native UserForm/ribbon execution,
full worksheet evaluation during optimization, native stop/cancel, apply and
recovery paths. Source review/reference checks are not native execution tests.
