Build the samples against the source, not a package from two majors ago

[Rafael-SOWNet]

Answers the question of whether the samples need pinning at all. Measured: they do not, and the pin was actively hiding a bug.

The change

SampleNet5 referenced AngouriMath 1.3.0 and FSharpSample referenced AngouriMath.FSharp 1.3.0, while every other project in the solution uses a ProjectReference. Both now do too.

The usual argument for a PackageReference in a sample is that it demonstrates what a consumer actually gets. This pin did not do that — it demonstrated neither the current source nor the current release, only January's 1.3.0. What it did do was keep the samples out of every tree-wide change: the Latexise rename in #842 swept the whole repository and skipped them silently, which is how I found them.

SampleNet5 needed the rename applied. FSharpSample needed nothing.

What running them turned up

Building was not enough. Both samples compiled clean and then crashed, in the same place:

FunctionArgumentCountException: integral should have exactly 4 arguments
or 2 arguments but 3 arguments are provided

Both called integral(f, x, 1). Measured across three published versions rather than inferred:

version	integral(f, x, 1)	derivative(f, x, 1)
1.3.0	accepted → integral(f, x)	accepted
1.4.0	throws	accepted
2.0.0-preview.1	throws	accepted

So this is not a 2.0 change — it shipped in 1.4.0. Both samples have been broken against the current release since January, and the 1.3.0 pin is exactly why nobody could see it.

They now use the two-argument form, which is what 1.3.0 turned the three-argument one into anyway (integral(f, x, 1) printed as integral(f, x)), so the samples are unchanged in meaning.

Filed separately as #847, since whether integral should regain the three-argument form — or whether derivative keeping it is the inconsistency — is a decision rather than a cleanup.

Measured

[0] Samples/SampleNet5/SampleNet5.csproj   :: 0 err, 0 warn
[0] Samples/FSharpSample/FSharpSample.fsproj :: 0 err, 0 warn

Both run to completion against 2.0. SampleNet5's last line:

{x}^{y}+\sqrt{x}+\int \frac{\sqrt{x}}{a}\,\mathrm{d}x+\frac{\mathrm{d}}{\mathrm{d}x}\frac{\sqrt{x}}{a}+\lim_{x\to \infty } \frac{\sqrt{x}}{a}

Worth considering separately

Nothing builds or runs these in CI. That is what let a sample stay broken for seven months. A job that runs both would have caught it the week it happened, and would catch the next one.

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