chore: remove dead toolFormat code from getEnvironmentDetails (RooCodeInc#11207)

Remove the toolFormat constant and <tool_format> line from environment
details output. Native tool calling is now the only supported protocol,
making this code unnecessary.

Fixes RooCodeInc#11206

Co-authored-by: Roo Code <roomote@roocode.com>

Author: roomote[bot]

src/core/environment/getEnvironmentDetails.ts

@@ -221,13 +221,10 @@ export async function getEnvironmentDetails(cline: Task, includeFileDetails: boo
 		language: language ?? formatLanguage(vscode.env.language),
 	})
 
-	const toolFormat = "native"
-
 	details += `\n\n# Current Mode\n`
 	details += `<slug>${currentMode}</slug>\n`
 	details += `<name>${modeDetails.name}</name>\n`
 	details += `<model>${modelId}</model>\n`
-	details += `<tool_format>${toolFormat}</tool_format>\n`
 
 	// Add browser session status - Only show when active to prevent cluttering context
 	const isBrowserActive = cline.browserSession.isSessionActive()