console: core/src/server/index.ts:57 — console.log for dev mode notification

## Violation
```typescript
console.log('Running in Development Mode (auto-restart enabled)');
```

## Location
`core/src/server/index.ts` line 57

## Why It Matters
Even development-mode messages should be emitted through a structured logger for consistency and so they are captured in log output.

## Suggested Fix
Replace with `logger.info(...)`.

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*Found by automated code hygiene audit*