fix: define parameter reader destructor out of line

[galjos]

Closes #339.

• define ParameterFileReader destruction where ParameterFileSection is complete
• keep parsing behavior unchanged

Validation:

• AppleClang Debug build of testParameterFileReader
• testParameterFileReader passed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.84%. Comparing base (bd813b4) to head (3a1c003).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #340   +/-   ##
=======================================
  Coverage   89.83%   89.84%           
=======================================
  Files         293      293           
  Lines       11446    11447    +1     
  Branches     3604     3604           
=======================================
+ Hits        10283    10284    +1     
  Misses       1122     1122           
  Partials       41       41           

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[pq-perf-bot]

⚡ Performance (instruction count) — ✅ no regressions

per-benchmark breakdown

benchmark	base Ir	PR Ir	Δ
bondedForces	41.46M	41.46M	-0.00%	✅
boxTransforms	10.67M	10.67M	+0.00%	✅
constraints	11.38M	11.38M	-0.00%	✅
coulombKernel	5.80M	5.80M	+0.00%	✅
forceKernel	15.33M	15.33M	+0.00%	✅
integrator	32.17M	32.17M	-0.00%	✅
kinetics	9.53M	9.53M	+0.00%	✅
linearAlgebra	2.07M	2.07M	+0.00%	✅
nonCoulombPairs	5.48M	5.48M	-0.00%	✅
shiftVector	5.81M	5.81M	+0.00%	✅
virial	11.64M	11.63M	-0.07%	✅

_{Deterministic callgrind instruction counts vs the base branch; gated at ±2%. Not wall-clock.}

[galjos]

Superseded by #385, which combines the simulation edge-case fixes.