🛡️ Sentinel: Enforce max version string length (DoS prevention)

[google-labs-jules]

🛡️ Sentinel: [MEDIUM] Fix DoS risk via long input strings

Severity: MEDIUM
Vulnerability: The version comparison logic accepted strings of arbitrary length. Extremely long strings could cause CPU exhaustion or OOM due to internal string operations (replace, split) and regex checks.
Impact: Denial of Service (DoS) if user-supplied input is passed unchecked to the library.
Fix: Enforced a MAX_VERSION_LENGTH of 256 characters. Inputs longer than this are immediately rejected (return NaN), preserving existing fail-closed behavior.
Verification: Added a test case in src/security.test.ts verifying that a string of 300 characters is rejected.

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PR created automatically by Jules for task 4012677338304431508 started by @srod

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Summary by cubic

Enforces a 256-character max for version strings to prevent DoS from extremely long inputs. Inputs over the limit now fail closed by returning NaN.

• Bug Fixes
  • Added MAX_VERSION_LENGTH check in compareTo; rejects inputs >256 chars (returns NaN).
  • Added a test that ensures 300-char inputs make isAtLeast/isAtMost return false.

^{Written for commit f598875. 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 (f598875).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #799   +/-   ##
=========================================
  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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