feat(telegram): add user ID mention support via tg://user?id= links

[dagebot]

Summary

When users don't have a Telegram username, we can now mention them using tg://user?id=USER_ID links in Markdown format.

Changes

telegram_send.py

• Added --source-user-id argument for specifying user ID when username is not available
• Added --source-display-name argument for custom display name in the mention link
• Mention format: [Display Name](tg://user?id=USER_ID)
• Fallback priority:
  1. If --source-user-id is provided, use tg://user?id= link mention
  2. If only --source-username is provided, use @username mention
  3. If neither is provided, send without mention prefix

SKILL.md

• Updated execution policy documentation to mention --source-user-id option
• Added example command for bot-to-bot communication without username
• Updated script interface reference with new arguments

Example Usage

# Mention user by ID (no username needed)
uv run ./scripts/telegram_send.py \
  --chat-id -1001234567890 \
  --message "Hello!" \
  --source-is-bot \
  --source-user-id 565293768 \
  --source-display-name "Frost"

Context

This is a common scenario in Telegram where many users don't set a username. Previously, we could only mention users with @username. Now we can mention any user by their numeric ID.