Summary

• Wrap all bot.api.sendXxx() media calls in delivery.ts with error handler that logs failures before re-throwing
• Wrap fetch() in telegram onboarding with try/catch to gracefully handle network errors

Problem

The gateway crashes due to unhandled promise rejections from Telegram API calls. When bot.api.sendPhoto() (or other media sends) fails due to network issues, the error propagates as an unhandled rejection and triggers process.exit(1) in the global handler.

Before: Network failure → unhandled rejection → gateway crash
After: Network failure → logged with context → error propagates to caller → graceful handling

Changes

src/telegram/bot/delivery.ts

Added withMediaErrorHandler() wrapper that:

1. Catches errors from media API calls
2. Logs them with context via runtime.error()
3. Re-throws so callers can handle appropriately

await withMediaErrorHandler("sendPhoto", runtime, () =>
  bot.api.sendPhoto(chatId, file, { ...mediaParams }),
);

src/channels/plugins/onboarding/telegram.ts

Wrapped the fetch() call for username lookup:

• Returns null on network errors (user can retry with numeric ID)
• Also checks res.ok before parsing JSON

Test Plan

• Verify gateway doesn't crash when Telegram API times out
• Verify media sends still work normally
• Verify onboarding handles network errors gracefully

Fixes #2487
Fixes #2272

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