Fix SPH correction operator lifecycle

[svchb]

Summary

• split correction updates into global density, pressure, boundary, gradient, and surface phases
• route density, gradient, and force correction roles independently
• update WCSPH, EDAC, wall, rigid-body, and TLSPH systems through the shared lifecycle
• ensure correction results are independent of system declaration order
• split correction tests into focused lifecycle and method files

Scope

This foundation intentionally excludes method-specific numerical hardening and conservative asymmetric pressure changes. Those are isolated in the draft follow-up PRs starting with #1292.

Isolated layer: 16 files, 520 additions, 40 deletions.

Verification

• complete unit suite passed
• lifecycle ordering and boundary density/pressure tests passed
• JuliaFormatter and git diff --check passed

[codecov]

Codecov Report

❌ Patch coverage is 78.67868% with 71 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.01%. Comparing base (a720b1d) to head (d855b76).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
test/general/corrections/common.jl	0.00%	61 Missing ⚠️
...c/schemes/structure/total_lagrangian_sph/system.jl	87.17%	5 Missing ⚠️
.../schemes/boundary/wall_boundary/dummy_particles.jl	91.30%	2 Missing ⚠️
...rc/schemes/fluid/entropically_damped_sph/system.jl	94.44%	2 Missing ⚠️
src/general/abstract_system.jl	93.75%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (a720b1d) and HEAD (d855b76). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (a720b1d)	HEAD (d855b76)
total	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1284       +/-   ##
===========================================
- Coverage   90.39%   78.01%   -12.38%     
===========================================
  Files         138      140        +2     
  Lines       11322    11605      +283     
===========================================
- Hits        10234     9054     -1180     
- Misses       1088     2551     +1463     

Flag	Coverage Δ
total	?
unit	78.01% <78.67%> (+0.53%)	⬆️

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[svchb]

Tested locally and reviewed. No performance regression. On 17.8.2026.