Add REPORT.md analyzing upstream JSONassert issues for incorporation

[Copilot]

Analyzed all 68 open issues and open PRs from skyscreamer/JSONassert to identify bugs, security issues, and fixes worth incorporating into JSONassertify.

Report structure

• 20 issues analyzed — categorized by priority with affected code paths and fix recommendations
• 6 already-addressed items — documents what JSONassertify's existing changes (org.json migration, Java 8 target, GitHub Actions) already resolve
• Actionable summary — prioritized into high/medium/low buckets

High priority findings

• Long comparison precision loss (#203) — DefaultComparator.areNotSameDoubles() converts longs to doubles, silently treating distinct values like 3965376318358833921 and 3965376318358833920 as equal
• JSONParser rejects null, true, false (#205) — valid JSON primitives throw JSONException
• Trailing wildcard broken in Customization (#204) — foo.* doesn't match foo.bar due to String.split() discarding trailing empty strings
• JSONString comparison failures have no detail (#101) — result.fail("") omits expected/actual values; one-line fix

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.51%. Comparing base (f67be44) to head (dd81d78).

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #88   +/-   ##
=========================================
  Coverage     94.51%   94.51%           
  Complexity      301      301           
=========================================
  Files            15       15           
  Lines           602      602           
  Branches        109      109           
=========================================
  Hits            569      569           
  Misses           14       14           
  Partials         19       19           

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