Channel permission protocol: add 'always_allow' behavior option

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

Currently the notifications/claude/channel/permission protocol only supports behavior: 'allow' | 'deny'. There's no way for a channel plugin (e.g. Telegram) to signal that a permission should be permanently allowed.

Proposed Solution

Add behavior: 'always_allow' so Claude Code can handle the persistence natively, the same way the terminal "Always Allow" option does.

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

Channel heavy work can be VERY repetitive when not beeing able to always allow some permissions.

Additional Context

_No response_