fix(agent): improve team lead delegation messaging + group chat reply hint

- Team lead: no completion language after delegating, no question phrasing
- Group chat: inject reply context hint (NO_REPLY when reply addresses others)
- Both v1 and v2 team lead sections updated

internal/bootstrap/templates/AGENTS.md

@@ -57,6 +57,7 @@ You start fresh each session. Use tools to maintain continuity:
 - The conversation flows fine without you
 - Adding a message would interrupt the vibe
 
+
 **The rule:** Humans don't respond to every message. Neither should you. Quality > quantity.
 
 **Avoid the triple-tap:** Don't respond multiple times to the same message. One thoughtful response beats three fragments.