refactor: rename 'tier' to 'level' across the codebase

- Updated WorkerState type to use 'level' instead of 'tier'.
- Modified functions related to worker state management, including parseWorkerState, emptyWorkerState, getSessionForLevel, activateWorker, and deactivateWorker to reflect the new terminology.
- Adjusted health check logic to utilize 'level' instead of 'tier'.
- Refactored tick and setup tools to accommodate the change from 'tier' to 'level', including model configuration and workspace scaffolding.
- Updated tests to ensure consistency with the new 'level' terminology.
- Revised documentation and comments to reflect the changes in terminology from 'tier' to 'level'.

lib/tools/status.ts

@@ -62,8 +62,8 @@ export function createStatusTool(api: OpenClawPluginApi) {
             name: project.name,
             groupId: pid,
             roleExecution: project.roleExecution ?? "parallel",
-            dev: { active: project.dev.active, issueId: project.dev.issueId, tier: project.dev.tier, startTime: project.dev.startTime },
-            qa: { active: project.qa.active, issueId: project.qa.issueId, tier: project.qa.tier, startTime: project.qa.startTime },
+            dev: { active: project.dev.active, issueId: project.dev.issueId, level: project.dev.level, startTime: project.dev.startTime },
+            qa: { active: project.qa.active, issueId: project.qa.issueId, level: project.qa.level, startTime: project.qa.startTime },
             queue: { toImprove: count("To Improve"), toTest: count("To Test"), toDo: count("To Do") },
           };
         }),