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/bootstrap-hook.ts

@@ -17,8 +17,8 @@ import { getSessionKeyRolePattern } from "./roles/index.js";
  *
  * Session key format: `agent:{agentId}:subagent:{projectName}-{role}-{level}`
  * Examples:
- *   - `agent:devclaw:subagent:my-project-dev-mid`   → { projectName: "my-project", role: "dev" }
- *   - `agent:devclaw:subagent:webapp-qa-mid`        → { projectName: "webapp", role: "qa" }
+ *   - `agent:devclaw:subagent:my-project-developer-medior` → { projectName: "my-project", role: "developer" }
+ *   - `agent:devclaw:subagent:webapp-tester-medior`        → { projectName: "webapp", role: "tester" }
  *
  * Note: projectName may contain hyphens, so we match role from the end.
  */