Format constant.go comments for pkg.go.dev

[Copilot]

Comments in constant.go used block format and didn't follow pkg.go.dev conventions, resulting in poor documentation rendering.

Changes

• Converted block comments to line comments - Replaced /* */ with // format for Variables, Comparison, Multiply, and ToSymbolic methods
• Doc comments now start with identifier names - All exported functions, types, and constants follow the // IdentifierName does X pattern
• Constant comments moved inline - Each constant now has its own comment within the const block
• Minor fixes - Expanded MIP acronym, fixed typo ("represnting" → "representing"), corrected grammar

Before

/*
Variables
Description:

	Shares all variables included in the expression that is K.
	It is a constant, so there are none.
*/
func (c K) Variables() []Variable {

After

// Variables returns all variables included in the expression.
// For constant K, there are no variables, so it returns an empty slice.
func (c K) Variables() []Variable {

Reduces file from 261 to 237 lines with no functional changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.77%. Comparing base (0214315) to head (41a6cde).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
- Coverage   86.76%   85.77%   -0.99%     
==========================================
  Files          27       35       +8     
  Lines        3687     3185     -502     
==========================================
- Hits         3199     2732     -467     
+ Misses        440      396      -44     
- Partials       48       57       +9     

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