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/generate_router.py

@@ -249,6 +249,7 @@ class RouterGenerator:
                 "Go": f"Go 1.20+, requires {self.router_name} package",
                 "Rust": f"Rust 1.70+, requires {self.router_name} package",
                 "Java": f"Java 17+, requires {self.router_name} package",
+                "Kotlin": f"Kotlin 1.9+, JDK 17+, requires {self.router_name} package",
             }
             if language in compatibility_map:
                 compatibility = compatibility_map[language]