fix: unify agentType value domain to 'claude-code' | 'codex'

The streamed-output-evaluator used 'claude' while the rest of the
codebase used 'claude-code'. Align the evaluator type and all call
sites (message-agent-executor, task-scheduler) to use the canonical
'claude-code' | 'codex' domain consistently.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/task-scheduler.ts

@@ -331,7 +331,7 @@ async function runTask(
             streamedOutput,
             streamedState,
             {
-              agentType: isClaudeAgent ? 'claude' : 'codex',
+              agentType: isClaudeAgent ? 'claude-code' : 'codex',
               provider,
               shortCircuitTriggeredErrors: true,
             },