Import CommonSolve interface functions directly from CommonSolve

Changes:
- Add CommonSolve as a direct dependency in Project.toml
- Import init, solve, solve! directly from CommonSolve instead of SciMLBase
- Keep __init and __solve imported from SciMLBase (internal hooks)
- Remove unnecessary comment about DiffEqBase

This makes the dependency on CommonSolve explicit and clarifies that
the solve interface comes from CommonSolve.jl.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: ChrisRackauckas

lib/OptimizationBase/Project.toml

@@ -6,6 +6,7 @@ version = "3.0.0"
 [deps]
 ADTypes = "47edcb42-4c32-4615-8424-f2b9edc5f35b"
 ArrayInterface = "4fba245c-0d91-5ea0-9b3e-6abc04ee57a9"
+CommonSolve = "38540f10-b2f7-11e9-35d8-d573e4eb0ff2"
 DifferentiationInterface = "a0c0ee7d-e4b9-4e03-894e-1c5f64a51d63"
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
 FastClosures = "9aa1b823-49e4-5ca5-8b0f-3971ec8bab6a"
@@ -42,6 +43,7 @@ OptimizationZygoteExt = "Zygote"
 [compat]
 ADTypes = "1.9"
 ArrayInterface = "7.6"
+CommonSolve = "0.2"
 DifferentiationInterface = "0.7"
 DocStringExtensions = "0.9"
 Enzyme = "0.13.2"

lib/OptimizationBase/src/OptimizationBase.jl

@@ -5,6 +5,7 @@ using Reexport
 @reexport using SciMLBase, ADTypes
 
 using ArrayInterface, Base.Iterators, SparseArrays, LinearAlgebra
+import CommonSolve: init, solve, solve!
 import SciMLBase: OptimizationProblem,
                   OptimizationFunction, ObjSense,
                   MaxSense, MinSense, OptimizationStats,
@@ -13,7 +14,7 @@ import SciMLBase: OptimizationProblem,
                   allowscallback, requiresgradient,
                   requireshessian, requiresconsjac,
                   requiresconshess, supports_opt_cache_interface,
-                  __init, __solve, init, solve, solve!
+                  __init, __solve
 export ObjSense, MaxSense, MinSense
 export allowsbounds, requiresbounds, allowsconstraints, requiresconstraints,
        allowscallback, requiresgradient, requireshessian,

lib/OptimizationBase/src/solve.jl

@@ -1,5 +1,3 @@
-# Skip the DiffEqBase handling
-
 struct IncompatibleOptimizerError <: Exception
     err::String
 end