Captain now keeps v2 replies within each conversation channel's delivery
limit, preventing generated responses from being rejected by providers
such as Instagram, Facebook, and WhatsApp.
## Closes
-
https://linear.app/chatwoot/issue/AI-188/captain-should-respect-whatsapp-character-limits
## How to reproduce
1. Enable Captain v2 on an Instagram inbox.
2. Ask a question that produces a response longer than 1,000 characters.
3. Observe that Meta rejects the outgoing message with error 100 because
it exceeds Instagram's character limit.
## What changed
- Resolve the outbound character limit from the conversation channel,
including provider-specific Twilio limits.
- Add the resolved limit to the assistant and scenario prompts.
- Apply the same limit to the v2 structured response schema so the model
output conforms before delivery.
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Co-authored-by: Sony Mathew <sony@chatwoot.com>
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