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/services/health.ts

@@ -6,7 +6,7 @@
  */
 import type { StateLabel } from "../providers/provider.js";
 import {
-  getSessionForModel,
+  getSessionForTier,
   getWorker,
   updateWorker,
   type Project,
@@ -19,7 +19,7 @@ export type HealthIssue = {
   groupId: string;
   role: "dev" | "qa";
   message: string;
-  model?: string | null;
+  tier?: string | null;
   sessionKey?: string | null;
   hoursActive?: number;
   issueId?: string | null;
@@ -46,7 +46,7 @@ export async function checkWorkerHealth(opts: {
   const { workspaceDir, groupId, project, role, activeSessions, autoFix, provider } = opts;
   const fixes: HealthFix[] = [];
   const worker = getWorker(project, role);
-  const sessionKey = worker.model ? getSessionForModel(worker, worker.model) : null;
+  const sessionKey = worker.tier ? getSessionForTier(worker, worker.tier) : null;
 
   const revertLabel: StateLabel = role === "dev" ? "To Do" : "To Test";
   const currentLabel: StateLabel = role === "dev" ? "Doing" : "Testing";
@@ -62,14 +62,14 @@ export async function checkWorkerHealth(opts: {
     }
   }
 
-  // Check 1: Active but no session key for current model
+  // Check 1: Active but no session key for current tier
   if (worker.active && !sessionKey) {
     const fix: HealthFix = {
       issue: {
         type: "active_no_session", severity: "critical",
         project: project.name, groupId, role,
-        model: worker.model,
-        message: `${role.toUpperCase()} active but no session for model "${worker.model}"`,
+        tier: worker.tier,
+        message: `${role.toUpperCase()} active but no session for tier "${worker.tier}"`,
       },
       fixed: false,
     };
@@ -86,7 +86,7 @@ export async function checkWorkerHealth(opts: {
       issue: {
         type: "zombie_session", severity: "critical",
         project: project.name, groupId, role,
-        sessionKey, model: worker.model,
+        sessionKey, tier: worker.tier,
         message: `${role.toUpperCase()} session not in active sessions list`,
       },
       fixed: false,
@@ -94,7 +94,7 @@ export async function checkWorkerHealth(opts: {
     if (autoFix) {
       await revertIssueLabel(fix);
       const sessions = { ...worker.sessions };
-      if (worker.model) sessions[worker.model] = null;
+      if (worker.tier) sessions[worker.tier] = null;
       await updateWorker(workspaceDir, groupId, role, { active: false, issueId: null, sessions });
       fix.fixed = true;
     }