Add config options to cap max number of open tabs

[w32zhong]

It is very easy for agents to keep opening tabs without closing them. I know there are an inactive timeout option to keep the number of daemon sessions from growing up, however, the total number of tabs should also be capped and i don't find a way to do this. Any ideas?

[holny]

Taking this. Proposed shape:

• New global option --max-tabs <n> (plus AGENT_BROWSER_MAX_TABS env), 0/unset = unlimited, applies per daemon session like the other launch options.
• Enforced daemon-side so both CLI and MCP surfaces are covered: tab new and any action that would create an additional tab fail with a clear error stating the current count, the cap, and pointing at tab close / close to free a slot.
• Deliberately no automatic tab killing: silently closing the agent's pages would be worse than a refusal, so the cap refuses instead.

PR to follow.

[mami1881]

// 2) veritabanına kaydet
SaveToDatabase(order);

// 3) ödeme işle
ProcessPayment(order);

// 4) mail gönder
SendEmail(order);

}

void SaveToDatabase(Order order) { }
void ProcessPayment(Order order) { }
void SendEmail(Order order) { }