feat(config): Implement TASK_MASTER_PROJECT_ROOT support for project root resolution

- Added support for the TASK_MASTER_PROJECT_ROOT environment variable in MCP configuration, establishing a clear precedence order for project root resolution.
- Updated utility functions to prioritize the environment variable, followed by args.projectRoot and session-based resolution.
- Enhanced error handling and logging for project root determination.
- Introduced new tasks for comprehensive testing and documentation updates related to the new configuration options.

scripts/modules/ai-services-unified.js

@@ -21,7 +21,7 @@ import {
 	getBaseUrlForRole,
 	isApiKeySet
 } from './config-manager.js';
-import { log, resolveEnvVariable, findProjectRoot } from './utils.js';
+import { log, findProjectRoot } from './utils.js';
 
 import * as anthropic from '../../src/ai-providers/anthropic.js';
 import * as perplexity from '../../src/ai-providers/perplexity.js';