🛡️ Sentinel: [MEDIUM] Fix DoS vulnerability in version comparison logic

[google-labs-jules]

Vulnerability:
The version comparison logic (compareTo in src/index.ts) previously attempted to process strings of any length.
Attackers could supply extremely long strings (e.g., 10MB+) to methods like isAtLeast or isAbove, causing:

1. Excessive memory allocation (creating new strings via replace and arrays via split).
2. Potential Event Loop blocking (CPU exhaustion).

Fix:
Introduced a MAX_VERSION_LENGTH constant (256 characters).
The compareTo function now "fails fast" by returning NaN (which evaluates to false in comparisons) if the input string exceeds this limit.

Verification:
Added performance/DoS regression tests in src/security.test.ts ensuring that massive strings are rejected immediately (<100ms) and return false.
Ran existing tests (src/index.test.ts) to ensure no regressions for valid inputs.

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PR created automatically by Jules for task 13226085722345310659 started by @srod

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Summary by cubic

Fixes a DoS risk in version comparison by limiting input length to 256 characters and failing fast. Long inputs now return false quickly, preventing memory and CPU spikes.

• Bug Fixes
  • Enforced MAX_VERSION_LENGTH (256) in compareTo; return NaN when exceeded so isAtLeast/isAbove resolve to false.
  • Added regression tests ensuring 1MB+ inputs are rejected in under 100ms without parsing.

^{Written for commit 907bb8f. Summary will update on new commits.}

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[changeset-bot]

🦋 Changeset detected

Latest commit: 907bb8f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
node-version	Patch

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (67d8793) to head (907bb8f).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #818   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           46        49    +3     
  Branches        16        17    +1     
=========================================
+ Hits            46        49    +3     

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

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