fix(update-tasks): Improve AI response parsing for 'update' command

Refactors the JSON array parsing logic within
in .

The previous logic primarily relied on extracting content from markdown
code blocks (json or javascript), which proved brittle when the AI
response included comments or non-JSON text within the block, leading to
parsing errors for the  command.

This change modifies the parsing strategy to first attempt extracting
content directly between the outermost '[' and ']' brackets. This is
more robust as it targets the expected array structure directly. If
bracket extraction fails, it falls back to looking for a strict json
code block, then prefix stripping, before attempting a raw parse.

This approach aligns with the successful parsing strategy used for
single-object responses in  and resolves the
parsing errors previously observed with the  command.

scripts/modules/task-manager/update-task-by-id.js

@@ -380,7 +380,7 @@ The changes described in the prompt should be thoughtfully applied to make the t
 		let loadingIndicator = null;
 		if (outputFormat === 'text') {
 			loadingIndicator = startLoadingIndicator(
-				useResearch ? 'Updating task with research...' : 'Updating task...'
+				useResearch ? 'Updating task with research...\n' : 'Updating task...\n'
 			);
 		}