refactor: replace console.log/chalk with ActivityLogger across services

- Add ActivityLogger interface wrapping Temporal's Context.current().log
- Thread logger parameter through claude-executor, message-handlers, git-manager, prompt-manager, reporting, and agent validators
- Remove chalk dependency from all service/activity files; CLI files keep console.log for terminal output
- Replace colorFn: ChalkInstance parameter with structured logger.info/warn/error calls
- Use replay-safe `log` import from @temporalio/workflow in workflows.ts

src/types/agents.ts

@@ -41,7 +41,9 @@ export type PlaywrightAgent =
   | 'playwright-agent4'
   | 'playwright-agent5';
 
-export type AgentValidator = (sourceDir: string) => Promise<boolean>;
+import type { ActivityLogger } from '../temporal/activity-logger.js';
+
+export type AgentValidator = (sourceDir: string, logger: ActivityLogger) => Promise<boolean>;
 
 export type AgentStatus =
   | 'pending'