[lmiq]

Removes the non-inferable code in the ParticleSystem constructors that blocks compiling packages that use CellListMap with juliac --trim=safe. Found while compiling Packmol.jl to a standalone executable. None of the changes break existing code.

Changes

• ParticleSystemPositions.updated is now a concrete Base.RefValue{Bool} instead of the abstract Ref{Bool}. Every updated[] read and write was a dynamic call (CellLists.jl, NonPeriodicCells.jl).
• The constructor no longer reassigns output. That variable is captured by the comprehension that builds the threaded outputs, so it was boxed (Core.Box). With reset = false, _reset_all_output! returns output unchanged, so the assignment did nothing.
• New get_dim method for SVector coordinates. It takes the dimension from the coordinate type, so Val(DIM) is a compile-time constant even when the unit cell is a Vector/Matrix. The unit cell size is still checked at runtime.
• New feature: output_name now also accepts a Val, e.g. output_name = Val(:forces). The defaults are now Vals, so constructing without output_name is fully inferable. Passing a Symbol works exactly as before, through a dynamic call. InPlaceNeighborList now passes Val(:nb) internally.

Changelog and docs

• CHANGELOG.md: under 0.10.6-DEV, a FEATURE entry for output_name = Val(...) and an ENHANCEMENT entry for type-stable construction.
• Docs: new "Type-stable construction" section in ParticleSystem/options.md (when the constructor is inferable, with a runnable example, and why it matters for juliac --trim), linked from the paragraph in single_set_simple.md that introduces output_name. That paragraph's broken sentence ("the output value from the system.output field") is fixed too.
• The docs build succeeds locally. The only warning is the existing large-output one on examples.md.

Testing

• New test item, "ParticleSystem constructor type stability": checks @inferred on the keyword constructor (one and two position sets; unitcell as Vector, Matrix, SVector, and nothing), that Symbol names still work, and that a dimension mismatch still throws.
• The full test suite passes locally (Julia 1.12).
• Trim check: I built Packmol.jl with juliac --trim=safe. Verifier errors raised inside CellListMap's own source dropped from 32 (v0.10.5) to 0. The remaining ones are on the Packmol side.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.53%. Comparing base (e9c7540) to head (64eb4d1).

Files with missing lines	Patch %	Lines
src/internals/auxiliary_functions.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   98.65%   98.53%   -0.12%     
==========================================
  Files          21       21              
  Lines        1632     1640       +8     
==========================================
+ Hits         1610     1616       +6     
- Misses         22       24       +2     

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