pounce-restoration 0.6.0

Restoration phase for POUNCE (port of Ipopt's Algorithm/Resto*): RestoIpoptNLP, RestoMinC_1Nrm, RestoFilterConvCheck, etc. Implemented and wired into the solve — the filter line search routes failed steps into the nested feasibility sub-IPM. Remaining Phase-10 work: upstream bit-equivalence of the restoration Hessian assembly and full recovery-trace validation.