test: add isSupportedLanguage, getSupportedLanguages, and Java analyzer coverage

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Summary

Adds unit tests for previously untested code paths, growing the unit test count from 65 to 79 tests.

Changes

src/unit/unit.test.ts

• isSupportedLanguage() tests (3 new): covers all 8 supported language IDs, unsupported/unknown languages, and case-sensitivity
• getSupportedLanguages() tests (3 new): verifies all expected languages are present, minimum count, and consistency with isSupportedLanguage()
• Java Analyzer Additional Coverage (8 new): for loop, enhanced-for (for-each), while, do-while, catch clause, ternary expression, nesting penalty, and multi-method analysis

Why

isSupportedLanguage() was added in #305 but had no dedicated unit tests. The Java analyzer (added in #296) had only 2 test cases; the new tests cover all remaining control-flow constructs.

Test Status

npm run compile  → success
npm run lint     → success
npm run test:unit → 79 passing (0 failing)

VS Code integration tests require a display server and are infrastructure-dependent — unrelated to these changes.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.91%. Comparing base (d437734) to head (fae9d7e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #310      +/-   ##
==========================================
+ Coverage   71.40%   71.91%   +0.51%     
==========================================
  Files          12       12              
  Lines        3521     3521              
  Branches      346      350       +4     
==========================================
+ Hits         2514     2532      +18     
+ Misses       1005      987      -18     
  Partials        2        2              

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Pull request overview

Adds Node-only unit tests to increase coverage for language-support helpers in MetricsAnalyzerFactory and to exercise additional Java cognitive-complexity constructs/edge cases. This strengthens regression protection for both the language routing layer and the Java analyzer’s construct accounting.

Changes:

• Added unit tests for MetricsAnalyzerFactory.isSupportedLanguage() across supported, unsupported, and case-variant language IDs.
• Added unit tests for MetricsAnalyzerFactory.getSupportedLanguages() to validate expected IDs and consistency with isSupportedLanguage().
• Expanded Java analyzer unit coverage for loop constructs, catch clauses, ternaries, nesting penalty, and multi-method analysis.