Refactor setup and tool helpers for improved modularity and clarity

- Moved setup logic into dedicated files: agent.ts, config.ts, index.ts, workspace.ts.
- Introduced tool-helpers.ts for shared functions across tools, reducing boilerplate.
- Updated tools (status, task-comment, task-create, task-update, work-finish, work-start) to utilize new helper functions for workspace resolution and provider creation.
- Enhanced error handling and context detection in tools.
- Improved project resolution logic to streamline tool execution.
- Added new functionality for agent creation and configuration management in setup.

lib/tools/setup.ts

@@ -2,12 +2,12 @@
  * setup — Agent-driven DevClaw setup.
  *
  * Creates agent, configures model tiers, writes workspace files.
- * Thin wrapper around lib/setup.ts.
+ * Thin wrapper around lib/setup/.
  */
 import type { OpenClawPluginApi } from "openclaw/plugin-sdk";
 import { jsonResult } from "openclaw/plugin-sdk";
 import type { ToolContext } from "../types.js";
-import { runSetup } from "../setup.js";
+import { runSetup } from "../setup/index.js";
 import { ALL_TIERS, DEFAULT_MODELS, type Tier } from "../tiers.js";
 
 export function createSetupTool(api: OpenClawPluginApi) {