Summary

• Add /start as a gateway-known Telegram command with quick-start guidance instead of rejecting Telegram's Start button.
• Keep /start non-destructive: it gives usage guidance rather than resetting the current session.
• Force the Telegram chat menu button to command mode on connect, best-effort, while preserving command registration if the menu-button call fails.
• Add focused tests for command menu registration, menu-button failure tolerance, and /start menu visibility.

Verification

• /Users/colecarden/.hermes/hermes-agent/.venv/bin/python -m py_compile hermes_cli/commands.py gateway/run.py gateway/platforms/telegram.py
• PYTHONPATH=/tmp/hermes-telegram-start-pr /Users/colecarden/.hermes/hermes-agent/.venv/bin/python -m pytest tests/gateway/test_telegram_command_menu.py -q — 3 passed
• git diff --check origin/main..HEAD
• Privacy/secret blocker scan on outgoing commit diff — clean

Notes

• Clean branch from current origin/main; excludes the TUI transcript-tail fix and unrelated local Hermes commits.