Remove the dependence on the reduced-memory Particle class

[The9Cat]

Summary

Routines in utils/Analysis used a Particle class with a reduced number of fields to lower the memory footprint. This is a bit confusing for maintenance and confuses compilers that do not distinguish file names by case (like clang).

Since the reduced Particle class is consistent with the full Particle class defined in include, this PR simply removes reference to the reduced version and uses the original.

[Copilot]

Pull request overview

This PR removes a redundant reduced-memory Particle class definition from utils/Analysis/Particle.h and the associated includes in four utility files. The reduced class was used to lower memory footprint but caused maintenance confusion and compatibility issues on case-insensitive filesystems where compilers couldn't distinguish between utils/Analysis/Particle.h and include/Particle.H.

Changes:

• Removes the reduced Particle.h file from utils/Analysis/
• Removes #include "Particle.h" from four utility files that never directly used the Particle class
• Simplifies the codebase by relying solely on the canonical include/Particle.H definition

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
utils/Analysis/Particle.h	Completely removed - eliminated the reduced-memory Particle class definition
utils/Analysis/xval_cyl.cc	Removed unused Particle.h include; uses PSP2.H's SParticle instead
utils/Analysis/mssaprof_halo.cc	Removed unused Particle.h include; doesn't use Particle class at all
utils/Analysis/haloprof_coef.cc	Removed unused Particle.h include; doesn't use Particle class at all
utils/Analysis/diskprof_coef.cc	Removed unused Particle.h include; doesn't use Particle class at all

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[michael-petersen]

Nice straightforward bit of cleanup.