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/config_extractor.py

@@ -77,6 +77,7 @@ class ConfigFile:
         "ini",
         "python",
         "javascript",
+        "kotlin-gradle",
         "dockerfile",
         "docker-compose",
     ]
@@ -215,6 +216,14 @@ class ConfigFileDetector:
                 "webpack.config.js",
             ],
         },
+        "kotlin-gradle": {
+            "patterns": ["*.gradle.kts"],
+            "names": [
+                "build.gradle.kts",
+                "settings.gradle.kts",
+                "gradle.properties",
+            ],
+        },
         "dockerfile": {
             "patterns": ["Dockerfile*"],
             "names": ["Dockerfile", "Dockerfile.dev", "Dockerfile.prod"],
@@ -358,7 +367,13 @@ class ConfigFileDetector:
             return "ci_cd_configuration"
 
         # Package configs
-        if filename in ["package.json", "pyproject.toml", "cargo.toml"]:
+        if filename in [
+            "package.json",
+            "pyproject.toml",
+            "cargo.toml",
+            "build.gradle.kts",
+            "settings.gradle.kts",
+        ]:
             return "package_configuration"
 
         # TypeScript/JavaScript configs