Reduce log volume and noisy expected failures

[parsakhaz]

Summary

• cap file log events at the logger write boundary with a truncation suffix
• keep detailed DB panel-state diagnostics opt-in and sanitized
• preserve latest config snapshots during queued atomic config saves
• demote expected archived-session late output noise without hiding malformed events

Testing

• pnpm --filter main typecheck
• pnpm --filter main exec eslint src/utils/logger.ts src/database/database.ts src/services/configManager.ts src/events.ts --quiet
• pnpm --filter main exec vitest run src/services/tests/worktreeFileSyncService.test.ts
• pnpm typecheck
• pnpm lint

Note: local validation emitted the existing Node engine warning because this shell is Node v20.19.3 and the repo declares >=22.14.0.