Add object tracking vignette

[eordog]

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[JoelPasvolsky]

@eordog, the doctest error on ValueError: array must not contain infs or NaNs is tricky but I can get it fixed locally (it requires NumPy > 2.6.2, for example 2.3.4 to recreate) with the changes in this review. I suspect that what is happening is that the test setups are getting mixed when run together before the code tests. I've reduced the setups to just two, one before the NL code examples and one for the CQM example, and separated these into two groups.

Locally when I run now I get just the expected NumPy errors on True_.

If this looks right to you, we'll see if a new commit runs in CI also without the ValueError: array must not contain infs or NaNs error, and then the remaining 8 NumPy errors will be fixed by @randomir's PR.

I'll review the rest separtely.

[JoelPasvolsky]

Looks good, thank you!

[JoelPasvolsky]

LGTM, Thanks!

(Just suggest adding the two linespaces to the code I mentioned)