feat(cli,gateway): add user-defined quick commands that bypass agent loop

[teyrebaz33]

Summary

Closes #744

Adds config-driven quick commands for both CLI and gateway that execute locally without invoking the LLM — zero token usage, works even when the provider is rate-limited or unavailable.

Config

# ~/.hermes/config.yaml
quick_commands:
  limits:
    type: exec
    command: /home/user/.local/bin/hermes-limits
  dn:
    type: exec
    command: echo daily-note

Behavior

• CLI: /dn matches before skill commands, runs the exec, prints output
• Gateway: /dn matches before skill commands, runs the exec, returns output as message
• Unsupported type or missing command field → clear error message
• 30s timeout with error message on expiry
• Unknown commands fall through to existing error handling

Changes

• hermes_cli/config.py — quick_commands: {} default
• cli.py — quick command check before skill commands in process_command()
• gateway/run.py — quick command check before skill commands in _handle_message()
• tests/test_quick_commands.py — 11 tests

Not implemented

Permissions/allowlisting (item 5) — marked optional in the issue, can be a follow-up.

[teknium1]

Merged in 359352b with docs in c532129 — thanks @teyrebaz33! 🎉

This is especially useful for running quick server checks from Telegram/Discord without burning tokens. Added documentation to:

• configuration.md: full section with practical examples (server status, disk usage, GPU monitoring, hermes-update)
• cli.md: brief section with config example and link to the config guide

All 2975 tests pass. Appreciate the contribution! 🙏