Add setConcurrency method

[Grufoony]

No description provided.

[Copilot]

Pull request overview

Adds a public API to configure TBB parallelism for DSF simulations, and wires it through to mobility evolution so runtime parallel work scales to the configured task arena.

Changes:

• Add Dynamics::setConcurrency(std::size_t) to reconfigure the underlying tbb::task_arena.
• Update RoadDynamics::evolve() to derive its partitioning from the task arena’s configured concurrency (instead of std::thread::hardware_concurrency()).
• Expose setConcurrency on the Python bindings for FirstOrderDynamics.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
src/dsf/mobility/RoadDynamics.hpp	Uses task-arena concurrency to size TBB work partitioning in evolve().
src/dsf/bindings.cpp	Exposes setConcurrency to Python (FirstOrderDynamics).
src/dsf/base/Dynamics.hpp	Implements task-arena initialization via TBB defaults and adds setConcurrency().

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[Copilot]

grainSize is now computed via floating-point division + floor and then cast back to std::size_t. This adds unnecessary complexity and can produce incorrect results for large numNodes due to loss of integer precision in double. Prefer pure integer arithmetic here (e.g., std::max<std::size_t>(1, numNodes / n_threads)), which matches the intent and avoids rounding issues.

Suggested change

	const auto grainSize = static_cast<std::size_t>(
	std::max(1., std::floor(static_cast<double>(numNodes) / n_threads)));
	const auto grainSize = std::max<std::size_t>(1, numNodes / n_threads);

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.78%. Comparing base (f503d0f) to head (429976a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
- Coverage   87.80%   87.78%   -0.03%     
==========================================
  Files          52       52              
  Lines        6208     6319     +111     
  Branches      689      701      +12     
==========================================
+ Hits         5451     5547      +96     
- Misses        738      753      +15     
  Partials       19       19              

Flag	Coverage Δ
unittests	87.78% <100.00%> (-0.03%)	⬇️

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