No changes needed - performance optimizations already applied

[Copilot]

The new comment (ID: 3787823181) is an informational status update from the PR author documenting performance optimizations already completed in commit 2079709.

Analysis

The comment describes changes that are already present in the codebase:

• Pointer-based interface: Residual() and Jacobian() methods use const double* and const std::size_t* instead of std::vector parameters
• Zero-copy access: AddForcingTerms() uses &cell_state[0] to access row data directly
• Single buffer allocation: SubtractJacobianTerms() allocates jac_buffer once outside the grid loop

// Current implementation (already optimized)
virtual double Residual(const double* concentrations, 
                        const std::size_t* indices) const = 0;

// In AddForcingTerms:
const double* concentrations = &cell_state[0];  // No copy
double residual = constraints_[...]->Residual(concentrations, indices);

Action Taken

No changes required. This is a status update, not a change request.

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[davidfillmore]

Closing - this was a status update, not a work request. Changes were already implemented in PR #900.