ANYsolver 0.4.2

Canonicalize solver-owned compact qualified-Q4 plastic state at the accepted Newton finalization boundary so committed final states replay exactly after valid plastic increments. Public sealing remains fail-closed. Qualified Q4/S3 mechanics, coefficients, recovery, formulation identities, tolerances, and defaults are unchanged.\n\nValidated by all 24 CI jobs plus exact ANYfem capacity source and installed-wheel regressions.