test: add coverage for ternary, catch, nullish coalescing, labeled jumps, and cache

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Summary

Adds 12 new unit tests across four new describe blocks to cover code paths that were previously untested. metricsAnalyzerFactory.ts now achieves 100 % statement, branch, function, and line coverage under npm run test:unit.

What was uncovered

Analyzer / Module	Previously uncovered paths
typescriptAnalyzer.ts	ternary expressions, catch clauses, ?? operator, labeled break/continue
javascriptAnalyzer.ts	same patterns
metricsAnalyzerFactory.ts	cache hits, cache eviction (LRU path), createAnalyzer error throw

New test suites added (in src/unit/unit.test.ts)

• TypeScript Analyzer Additional Coverage: ternary, try/catch, nullish coalescing ??, labeled break
• JavaScript Analyzer Additional Coverage: ternary, try/catch, nullish coalescing ??, labeled continue
• Analysis Cache Behavior: cache-hit consistency, LRU eviction with 21 distinct entries, unsupported language bypasses cache
• createAnalyzer Error Handling: verifies the informative error thrown when a module lacks the expected class

Coverage delta

File	Stmts before → after	Branches before → after
metricsAnalyzerFactory.ts	96.28 → 100	76.92 → 100
typescriptAnalyzer.ts	86.16 → 88.66	71.05 → 80.76
javascriptAnalyzer.ts	90.00 → 92.22	77.90 → 84.09

Test Status

• npm run compile ✅ no errors
• npm run lint ✅ no errors
• npm run test:unit ✅ 47 tests pass (was 35)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.80%. Comparing base (5f1c749) to head (ecbd02a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #247      +/-   ##
==========================================
+ Coverage   67.26%   68.80%   +1.53%     
==========================================
  Files           8        8              
  Lines        2936     2936              
  Branches      276      283       +7     
==========================================
+ Hits         1975     2020      +45     
+ Misses        959      914      -45     
  Partials        2        2              

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Pull request overview

This PR expands the Node.js unit test suite to cover previously untested cognitive-complexity paths in the JavaScript/TypeScript analyzers and MetricsAnalyzerFactory (cache behavior and createAnalyzer error handling), aiming to improve coverage under npm run test:unit.

Changes:

• Added new TypeScript analyzer tests for ternary, catch clauses, nullish coalescing, and labeled break.
• Added new JavaScript analyzer tests for the same patterns (with labeled continue).
• Added new tests targeting MetricsAnalyzerFactory cache behavior and createAnalyzer’s thrown error message.