feat: add Kotlin language support for codebase analysis (#287)

Adds full C3.x pipeline support for Kotlin (.kt, .kts):
- Language detection patterns (40+ weighted patterns for data/sealed classes, coroutines, companion objects, KMP, etc.)
- AST regex parser in code_analyzer.py (classes, objects, functions, extension functions, suspend functions)
- Dependency extraction for Kotlin import statements (with alias support)
- Design pattern adaptations (object→Singleton, companion→Factory, sealed→Strategy, data→Builder, Flow→Observer)
- Test example extraction for JUnit 4/5, Kotest, MockK, Spek
- Config detection for build.gradle.kts / settings.gradle.kts
- Extension maps registered in codebase_scraper, unified_codebase_analyzer, github_scraper, generate_router

Also fixes pre-existing parser count tests (35→36 for doctor command added in previous commit).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/skill_seekers/cli/unified_codebase_analyzer.py

@@ -559,6 +559,8 @@ class UnifiedCodebaseAnalyzer:
                         ".go": "Go",
                         ".rs": "Rust",
                         ".java": "Java",
+                        ".kt": "Kotlin",
+                        ".kts": "Kotlin",
                         ".rb": "Ruby",
                         ".php": "PHP",
                     }