Feat: Added automatic determination of task number based on complexity (#884)

- Added 'defaultNumTasks: 10' to default config, now used in 'parse-prd'
- Adjusted 'parse-prd' and 'expand-task' to:
  - Accept a 'numTasks' value of 0
  - Updated tool and command descriptions
  - Updated prompts to 'an appropriate number of' when value is 0
- Updated 'README-task-master.md' and 'command-reference.md' docs
- Added more tests for: 'parse-prd', 'expand-task' and 'config-manager'

Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

mcp-server/src/core/direct-functions/parse-prd.js

@@ -109,7 +109,7 @@ export async function parsePRDDirect(args, log, context = {}) {
 	if (numTasksArg) {
 		numTasks =
 			typeof numTasksArg === 'string' ? parseInt(numTasksArg, 10) : numTasksArg;
-		if (Number.isNaN(numTasks) || numTasks <= 0) {
+		if (Number.isNaN(numTasks) || numTasks < 0) {
 			// Ensure positive number
 			numTasks = getDefaultNumTasks(projectRoot); // Fallback to default if parsing fails or invalid
 			logWrapper.warn(