feat(phase-3): Task 3.3.4 - add import metadata extraction

Sub-task 3.3.4: Implement Import Metadata Extraction
- Added extractFileImports() method to extract all import statements from a file
- Imported extractImportInfo() from metadata-extractor (Phase 2)
- Imported ImportInfo type from types/metadata
- Returns array of ImportInfo to be included in all chunks

Implementation:
- Queries tree for import_statement nodes
- Uses extractImportInfo() from Phase 2 to parse each import
- Returns ImportInfo[] with source, symbols, isDefault, isDynamic, alias
- Gracefully handles extraction errors (import extraction is optional)

Benefits:
- All chunks will have import context as metadata
- Addresses Issue RooCodeInc#3 from CHUNKING_ANALYSIS.md (lost import context)
- Enables understanding of dependencies and types
- Complements Phase 2's metadata extraction

This will be integrated in Sub-task 3.3.5 to populate the imports field in CodeBlock:
- Extract imports once per file
- Include in all chunks from that file
- Provides type and dependency context

File modified: src/services/code-index/processors/parser.ts (+29 lines)

Sub-task 3.3.4 complete! Next: Sub-task 3.3.5 - Implement Smart Chunking Logic

Author: RepairYourTech

src/services/code-index/processors/parser.ts

@@ -17,7 +17,8 @@ import {
 import { TelemetryService } from "@roo-code/telemetry"
 import { TelemetryEventName } from "@roo-code/types"
 import { sanitizeErrorMessage } from "../shared/validation-helpers"
-import { extractSymbolMetadata } from "./metadata-extractor"
+import { extractSymbolMetadata, extractImportInfo } from "./metadata-extractor"
+import { ImportInfo } from "../types/metadata"
 
 /**
  * Implementation of the code parser interface
@@ -654,6 +655,33 @@ export class CodeParser implements ICodeParser {
 			startLine: commentStartLine + 1, // Convert to 1-based
 		}
 	}
+
+	/**
+	 * Extracts all import statements from a file
+	 * Returns import metadata to be included in all chunks from this file
+	 */
+	private extractFileImports(tree: any): ImportInfo[] {
+		const imports: ImportInfo[] = []
+
+		// Query for import statements
+		const importQuery = `(import_statement) @import`
+
+		try {
+			const matches = tree.rootNode.descendantsOfType("import_statement")
+
+			for (const importNode of matches) {
+				const importInfo = extractImportInfo(importNode)
+				if (importInfo) {
+					imports.push(importInfo)
+				}
+			}
+		} catch (error) {
+			// Silently fail - import extraction is optional
+			console.debug("Failed to extract imports:", error)
+		}
+
+		return imports
+	}
 }
 
 // Export a singleton instance for convenience