## Check-In (Required)

Your first message MUST display:

```
✓ Check-In: [project] | [branch] | [clean/dirty]
```

Actions:
1. Read `.invar/context.md` (Key Rules + Current State + Lessons Learned)
2. Show one-line status

**Do NOT execute verification at Check-In.**
Verification is for VALIDATE phase and Final only.

This is your sign-in. The user sees it immediately.
No visible check-in = Session not started.
