fix: move deduplicateReadFileHistory call from error handler to success path

- Deduplication now only triggers after successful read_file operations
- Fixed test mocks to include deduplicateReadFileHistory method
- All tests passing

src/core/tools/__tests__/readFileTool.spec.ts

@@ -126,6 +126,7 @@ describe("read_file tool with maxReadFileLine setting", () => {
 
 		mockCline.recordToolUsage = vi.fn().mockReturnValue(undefined)
 		mockCline.recordToolError = vi.fn().mockReturnValue(undefined)
+		mockCline.deduplicateReadFileHistory = vi.fn().mockResolvedValue(undefined)
 
 		toolResult = undefined
 	})
@@ -382,6 +383,7 @@ describe("read_file tool XML output structure", () => {
 		mockCline.recordToolUsage = vi.fn().mockReturnValue(undefined)
 		mockCline.recordToolError = vi.fn().mockReturnValue(undefined)
 		mockCline.didRejectTool = false
+		mockCline.deduplicateReadFileHistory = vi.fn().mockResolvedValue(undefined)
 
 		toolResult = undefined
 	})

src/core/tools/readFileTool.ts

@@ -589,6 +589,9 @@ export async function readFileTool(
 			// No status message, just push the files XML
 			pushToolResult(filesXml)
 		}
+
+		// Deduplicate read_file history after successful reads
+		await cline.deduplicateReadFileHistory()
 	} catch (error) {
 		// Handle all errors using per-file format for consistency
 		const relPath = fileEntries[0]?.path || "unknown"
@@ -609,8 +612,5 @@ export async function readFileTool(
 		const xmlResults = fileResults.filter((result) => result.xmlContent).map((result) => result.xmlContent)
 
 		pushToolResult(`<files>\n${xmlResults.join("\n")}\n</files>`)
-
-		// Deduplicate read_file history after successful reads
-		await cline.deduplicateReadFileHistory()
 	}
 }