Add .markdown extension support (quick win: +1,586 files covered)

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

Author: aksOps

src/code_intelligence/config.py

@@ -16,7 +16,7 @@ class DiscoveryConfig(BaseModel):
         ".java", ".py", ".ts", ".tsx", ".js", ".jsx",
         ".xml", ".yaml", ".yml", ".json", ".properties",
         ".gradle", ".gradle.kts", ".sql", ".graphql", ".gql",
-        ".proto", ".md",
+        ".proto", ".md", ".markdown",
         ".cs", ".go", ".tf", ".tfvars", ".hcl",
         ".cpp", ".cc", ".cxx", ".hpp", ".c", ".h",
         ".sh", ".bash", ".zsh", ".ps1", ".psm1", ".psd1",

src/code_intelligence/discovery/file_discovery.py

@@ -42,6 +42,7 @@ class ChangeType(Enum):
     ".gql": "graphql",
     ".proto": "proto",
     ".md": "markdown",
+    ".markdown": "markdown",
     ".bicep": "bicep",
     ".tf": "terraform",
     ".tfvars": "terraform",