fix: import alias handling, extensionless files, and Windows path validation

- TypeScript/Python import parsing now correctly handles aliased imports
  (e.g., `import { foo as bar }`) by extracting the original symbol name
- TypeScript import regex now matches `import type { ... }` syntax
- PluginRegistry.getForFile returns undefined for extensionless files
  instead of constructing invalid extension ".undefined"
- MCP server path validation now blocks Windows absolute paths (C:\)

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

Author: JSLEEKR

src/mcp/server.ts

@@ -102,7 +102,7 @@ export async function startMCPServer(): Promise<void> {
         if (value.includes('\0')) {
           throw new Error(`Invalid parameter "${key}": null bytes not allowed`);
         }
-        if (key === 'path' && (value.includes('..') || value.startsWith('/'))) {
+        if (key === 'path' && (value.includes('..') || value.startsWith('/') || /^[a-zA-Z]:[/\\]/.test(value))) {
           throw new Error(`Invalid path parameter: path traversal not allowed. Use relative paths within the project.`);
         }
       }

src/plugins/plugin-registry.ts

@@ -10,7 +10,9 @@ export class PluginRegistry {
   }
 
   getForFile(filePath: string): LanguagePlugin | undefined {
-    const ext = '.' + filePath.split('.').pop();
+    const parts = filePath.split('.');
+    if (parts.length < 2) return undefined; // no extension (e.g. Makefile)
+    const ext = '.' + parts.pop();
     return this.plugins.get(ext);
   }
 

src/plugins/python.ts

@@ -125,7 +125,12 @@ export class PythonPlugin implements LanguagePlugin {
       const toModule = match[1];
       const symbolNames = match[2]
         .split(',')
-        .map(s => s.trim())
+        .map(s => {
+          const trimmed = s.trim();
+          // Handle aliased imports: "foo as bar" → take original name "foo"
+          const asIndex = trimmed.indexOf(' as ');
+          return asIndex !== -1 ? trimmed.slice(0, asIndex).trim() : trimmed;
+        })
         .filter(Boolean);
       imports.push({ fromFile: filePath, toModule, symbols: symbolNames });
     }

src/plugins/typescript.ts

@@ -182,10 +182,15 @@ export class TypeScriptPlugin implements LanguagePlugin {
 
   private extractImports(filePath: string, source: string): ImportInfo[] {
     const imports: ImportInfo[] = [];
-    const importRegex = /import\s+\{([^}]+)\}\s+from\s+['"]([^'"]+)['"]/g;
+    const importRegex = /import\s+(?:type\s+)?\{([^}]+)\}\s+from\s+['"]([^'"]+)['"]/g;
     let match;
     while ((match = importRegex.exec(source)) !== null) {
-      const symbolNames = match[1].split(',').map(s => s.trim()).filter(Boolean);
+      const symbolNames = match[1].split(',').map(s => {
+        const trimmed = s.trim();
+        // Handle aliased imports: "foo as bar" → take original name "foo"
+        const asIndex = trimmed.indexOf(' as ');
+        return asIndex !== -1 ? trimmed.slice(0, asIndex).trim() : trimmed;
+      }).filter(Boolean);
       imports.push({
         fromFile: filePath,
         toModule: match[2],