Feature: Save transcript for R7 token reward redemptions

[RemainingDelta]

Overview

Adds transcript generation to the redemption ticket close flow, creating a persistent record of each redemption including token details and full message history.

Technical Requirements

• Hook transcript generation into the redemption ticket close flow
• Include item name, token cost, and before/after balance in the transcript header
• Save transcript to the designated redemption transcript channel
• Add REDEMPTION_TRANSCRIPT_CHANNEL_ID to features/config.py

Acceptance Criteria

• A transcript is saved every time a redemption ticket is closed
• Transcript includes item name, cost, and before/after token balance
• Full message history of the ticket is captured in the transcript
• Transcript channel ID is configurable via config.py

Notes

Item price and before/after balance will be available in the ticket embed as part of the redemption display enhancement ticket.

Branch

201-Feature