refactor: improve parameter display

[henry2004y]

No description provided.

[gemini-code-assist]

Code Review

This pull request updates the showhead function in src/io.jl to display parameters as key-value pairs when metadata is available, replacing the previous separate parameter list. Feedback suggests using more idiomatic Julia patterns, such as enumerate and zip for iteration and avoiding string concatenation in print calls to improve performance.

[github-actions]

Benchmark Results (Julia v1)

Time benchmarks

	master	5ea82dc...	master / 5ea82dc...
amrex/load	26.2 ± 0.59 μs	26 ± 0.55 μs	1.01 ± 0.031
amrex/phase_space_3d	6.07 ± 1.3 ms	5.94 ± 0.99 ms	1.02 ± 0.28
amrex/select_region	0.249 ± 0.012 ms	0.246 ± 0.012 ms	1.01 ± 0.07
amrex/select_region_from_files	0.825 ± 0.072 ms	0.822 ± 0.073 ms	1 ± 0.12
read/ASCII	0.755 ± 0.01 ms	0.717 ± 0.0097 ms	1.05 ± 0.02
read/Anisotropy	0.0321 ± 0.00027 ms	0.0322 ± 0.00029 ms	0.997 ± 0.012
read/Anisotropy Symbol	0.0321 ± 0.00026 ms	0.0322 ± 0.0003 ms	0.997 ± 0.012
read/Cutdir	2.35 ± 0.27 μs	2.35 ± 0.28 μs	1 ± 0.16
read/Cutdir subset	3.29 ± 0.35 μs	3.28 ± 0.33 μs	1 ± 0.15
read/Extract Bmag	0.621 ± 0.17 μs	0.601 ± 0.16 μs	1.03 ± 0.39
read/HDF5	0.0827 ± 0.0023 ms	0.0831 ± 0.0024 ms	0.995 ± 0.04
read/HDF5 extract	12.7 ± 0.9 μs	12.3 ± 0.76 μs	1.03 ± 0.097
read/Interp2d	0.931 ± 0.26 μs	0.792 ± 0.14 μs	1.18 ± 0.39
read/Load binary structured	0.044 ± 0.0023 ms	0.044 ± 0.0022 ms	0.998 ± 0.072
time_to_load	1.26 ± 0.0043 s	1.26 ± 0.021 s	1 ± 0.017

Memory benchmarks

	master	5ea82dc...	master / 5ea82dc...
amrex/load	0.212 k allocs: 9.67 kB	0.212 k allocs: 9.67 kB	1
amrex/phase_space_3d	0.059 k allocs: 18.3 MB	0.059 k allocs: 18.3 MB	1
amrex/select_region	3 allocs: 1.07 MB	3 allocs: 1.07 MB	1
amrex/select_region_from_files	0.05 k allocs: 7.48 MB	0.05 k allocs: 7.48 MB	1
read/ASCII	0.505 k allocs: 0.112 MB	0.505 k allocs: 0.112 MB	1
read/Anisotropy	3 allocs: 4.84 kB	3 allocs: 4.84 kB	1
read/Anisotropy Symbol	3 allocs: 4.84 kB	3 allocs: 4.84 kB	1
read/Cutdir	0.137 k allocs: 5.98 kB	0.137 k allocs: 5.98 kB	1
read/Cutdir subset	0.159 k allocs: 8.89 kB	0.159 k allocs: 8.89 kB	1
read/Extract Bmag	3 allocs: 4.09 kB	3 allocs: 4.09 kB	1
read/HDF5	0.1 k allocs: 3.67 kB	0.1 k allocs: 3.67 kB	1
read/HDF5 extract	17 allocs: 4.55 kB	17 allocs: 4.55 kB	1
read/Interp2d	12 allocs: 4.45 kB	12 allocs: 4.45 kB	1
read/Load binary structured	0.241 k allocs: 0.0757 MB	0.241 k allocs: 0.0757 MB	1
time_to_load	0.149 k allocs: 11.1 kB	0.149 k allocs: 11.1 kB	1

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.30%. Comparing base (d50c096) to head (5ea82dc).

Files with missing lines	Patch %	Lines
src/io.jl	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #154      +/-   ##
==========================================
- Coverage   81.33%   81.30%   -0.04%     
==========================================
  Files          20       20              
  Lines        3590     3599       +9     
==========================================
+ Hits         2920     2926       +6     
- Misses        670      673       +3     

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