Fix docs build: add git [sources] for unregistered QuadDIRECT (#1232)

* Fix docs build: add git [sources] entry for unregistered QuadDIRECT

The Documentation workflow fails at the very first instantiate step
(`Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()`) with:

    ERROR: expected package `QuadDIRECT [dae52e8d]` to be registered

`docs/Project.toml` lists `QuadDIRECT` (and `OptimizationQuadDIRECT`,
which depends on it) in `[deps]`, but `QuadDIRECT` is not registered in
General and had no `[sources]` entry, so the docs environment could not
resolve. Add a git `[sources]` entry pointing at the upstream repo, the
same source the docs page already instructs users to add manually.

Verified locally on Julia 1.12 (the docs CI channel): the docs
environment now resolves and instantiates; QuadDIRECT is pulled from
https://github.com/timholy/QuadDIRECT.jl.git and OptimizationQuadDIRECT
resolves against it.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* Fix docs build: SimpleOptimization linesearch API + dead doc links

The QuadDIRECT [sources] fix got the docs build past instantiate, which
then surfaced pre-existing makedocs errors [:example_block, :linkcheck].

- lib/SimpleOptimization: SimpleBFGS/SimpleLBFGS passed the obsolete
  `linesearch = Val(false)` to SimpleBroyden/SimpleLimitedMemoryBroyden.
  SimpleNonlinearSolve v2.x's `linesearch` keyword is
  `Union{Nothing, LineSearch.AbstractLineSearchAlgorithm}` and rejects
  `Val{false}` with a TypeError; `nothing` is the documented "no line
  search" value. This also fixes the sublibrary's own (red) Core tests.
- evolutionary.md: Evolutionary.jl moved wildart -> SciML; the four
  wildart.github.io/Evolutionary.jl/stable/{ga,de,es,cmaes}/ links 404.
  Repoint to sciml.github.io and the repo links to github.com/SciML.
- nlopt.md: http://ab-initio.mit.edu/nlopt/ is dead (linkcheck timeout);
  repoint the NLopt library link to https://nlopt.readthedocs.io/en/latest/.

Co-Authored-By: Chris Rackauckas <accounts@chrisrackauckas.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

docs/Project.toml

@@ -130,6 +130,9 @@ path = "../lib/OptimizationPyCMA"
 [sources.OptimizationQuadDIRECT]
 path = "../lib/OptimizationQuadDIRECT"
 
+[sources.QuadDIRECT]
+url = "https://github.com/timholy/QuadDIRECT.jl.git"
+
 [sources.OptimizationSciPy]
 path = "../lib/OptimizationSciPy"
 

docs/src/optimization_packages/evolutionary.md

@@ -1,6 +1,6 @@
 # Evolutionary.jl
 
-[`Evolutionary`](https://github.com/wildart/Evolutionary.jl) is a Julia package implementing various evolutionary and genetic algorithm.
+[`Evolutionary`](https://github.com/SciML/Evolutionary.jl) is a Julia package implementing various evolutionary and genetic algorithm.
 
 ## Installation: OptimizationEvolutionary.jl
 
@@ -15,16 +15,16 @@ Pkg.add("OptimizationEvolutionary");
 
 ### Without Constraint Equations
 
-The methods in [`Evolutionary`](https://github.com/wildart/Evolutionary.jl) are performing global optimization on problems without
+The methods in [`Evolutionary`](https://github.com/SciML/Evolutionary.jl) are performing global optimization on problems without
 constraint equations. These methods work both with and without lower and upper constraints set by `lb` and `ub` in the `OptimizationProblem`.
 
 A `Evolutionary` algorithm is called by one of the following:
 
-  - [`Evolutionary.GA()`](https://wildart.github.io/Evolutionary.jl/stable/ga/): **Genetic Algorithm optimizer**
+  - [`Evolutionary.GA()`](https://sciml.github.io/Evolutionary.jl/stable/ga/): **Genetic Algorithm optimizer**
 
-  - [`Evolutionary.DE()`](https://wildart.github.io/Evolutionary.jl/stable/de/): **Differential Evolution optimizer**
-  - [`Evolutionary.ES()`](https://wildart.github.io/Evolutionary.jl/stable/es/): **Evolution Strategy algorithm**
-  - [`Evolutionary.CMAES()`](https://wildart.github.io/Evolutionary.jl/stable/cmaes/): **Covariance Matrix Adaptation Evolution Strategy algorithm**
+  - [`Evolutionary.DE()`](https://sciml.github.io/Evolutionary.jl/stable/de/): **Differential Evolution optimizer**
+  - [`Evolutionary.ES()`](https://sciml.github.io/Evolutionary.jl/stable/es/): **Evolution Strategy algorithm**
+  - [`Evolutionary.CMAES()`](https://sciml.github.io/Evolutionary.jl/stable/cmaes/): **Covariance Matrix Adaptation Evolution Strategy algorithm**
 
 Algorithm-specific options are defined as `kwargs`. See the respective documentation for more detail.
 

docs/src/optimization_packages/nlopt.md

@@ -1,6 +1,6 @@
 # NLopt.jl
 
-[`NLopt`](https://github.com/jump-dev/NLopt.jl) is Julia package interfacing to the free/open-source [`NLopt library`](http://ab-initio.mit.edu/nlopt/) which implements many optimization methods both global and local [`NLopt Documentation`](https://nlopt.readthedocs.io/en/latest/NLopt_Algorithms/).
+[`NLopt`](https://github.com/jump-dev/NLopt.jl) is Julia package interfacing to the free/open-source [`NLopt library`](https://nlopt.readthedocs.io/en/latest/) which implements many optimization methods both global and local [`NLopt Documentation`](https://nlopt.readthedocs.io/en/latest/NLopt_Algorithms/).
 
 ## Installation: OptimizationNLopt.jl
 

lib/SimpleOptimization/src/SimpleOptimization.jl

@@ -181,7 +181,7 @@ function SciMLBase.__solve(cache::OptimizationCache{O}) where {O <: SimpleLBFGS}
         nlprob,
         SimpleLimitedMemoryBroyden(;
             threshold = __get_threshold(cache.opt),
-            linesearch = Val(false)
+            linesearch = nothing
         );
         maxiters = maxiters,
         abstol = abstol,
@@ -222,7 +222,7 @@ function SciMLBase.__solve(cache::OptimizationCache{O}) where {O <: SimpleBFGS}
     nlprob = NonlinearProblem(∇f, cache.u0)
     nlsol = solve(
         nlprob,
-        SimpleBroyden(; linesearch = Val(false));
+        SimpleBroyden(; linesearch = nothing);
         maxiters = maxiters,
         abstol = abstol,
         reltol = reltol