🎨 Palette: Add daysUntilEOL property

[google-labs-jules]

Palette added daysUntilEOL to the NodeVersion object. This micro-UX improvement (DX) allows developers to easily check how many days are left until a Node.js version reaches End-of-Life, without implementing date math themselves. It returns a number (days) or undefined. Documentation and tests were updated accordingly.

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PR created automatically by Jules for task 7714978807207570716 started by @srod

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Summary by cubic

Added daysUntilEOL to NodeVersion to return the number of days until the version’s EOL, making it easy to warn or schedule upgrades without date math.
It can be negative if EOL has passed, or undefined if unknown; documentation and tests updated.

^{Written for commit 5984151. Summary will update on new commits.}

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (0c22e76) to head (5984151).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #797   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines           46        49    +3     
  Branches        16        19    +3     
=========================================
+ Hits            46        49    +3     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

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[srod]

Superseded by #826 - closing duplicate bot-generated PR

[google-labs-jules]

Superseded by #826 - closing duplicate bot-generated PR

Understood. Acknowledging that this work is now obsolete and stopping work on this task.