refactor: migrate role handling from tiers to roles module

- Removed the deprecated tiers.ts file and migrated all related functionality to roles/index.js.
- Updated tests and tools to reflect the new role structure, replacing references to "dev", "qa", and "architect" with "developer", "tester", and "architect".
- Adjusted workflow configurations and state management to accommodate the new role naming conventions.
- Enhanced project registration and health check tools to support dynamic role handling.
- Updated task creation, update, and completion processes to align with the new role definitions.
- Improved documentation and comments to clarify role responsibilities and usage.

lib/notify.ts

@@ -21,7 +21,7 @@ export type NotifyEvent =
       issueId: number;
       issueTitle: string;
       issueUrl: string;
-      role: "dev" | "qa" | "architect";
+      role: string;
       level: string;
       sessionAction: "spawn" | "send";
     }
@@ -31,7 +31,7 @@ export type NotifyEvent =
       groupId: string;
       issueId: number;
       issueUrl: string;
-      role: "dev" | "qa" | "architect";
+      role: string;
       result: "done" | "pass" | "fail" | "refine" | "blocked";
       summary?: string;
       nextState?: string;