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

Implements config-driven quick commands for both CLI and gateway that
execute locally without invoking the LLM.

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

Changes:
- hermes_cli/config.py: add quick_commands: {} default
- cli.py: check quick_commands before skill commands in process_command()
- gateway/run.py: check quick_commands before skill commands in _handle_message()
- tests/test_quick_commands.py: 11 tests covering exec, timeout, unsupported type, missing command, priority over skills

Closes #744

cli.py

@@ -2400,9 +2400,32 @@ class HermesCLI:
         elif cmd_lower == "/reload-mcp":
             self._reload_mcp()
         else:
-            # Check for skill slash commands (/gif-search, /axolotl, etc.)
+            # Check for user-defined quick commands (bypass agent loop, no LLM call)
             base_cmd = cmd_lower.split()[0]
-            if base_cmd in _skill_commands:
+            quick_commands = self.config.get("quick_commands", {})
+            if base_cmd.lstrip("/") in quick_commands:
+                qcmd = quick_commands[base_cmd.lstrip("/")]
+                if qcmd.get("type") == "exec":
+                    import subprocess
+                    exec_cmd = qcmd.get("command", "")
+                    if exec_cmd:
+                        try:
+                            result = subprocess.run(
+                                exec_cmd, shell=True, capture_output=True,
+                                text=True, timeout=30
+                            )
+                            output = result.stdout.strip() or result.stderr.strip()
+                            self.console.print(output if output else "[dim]Command returned no output[/]")
+                        except subprocess.TimeoutExpired:
+                            self.console.print("[bold red]Quick command timed out (30s)[/]")
+                        except Exception as e:
+                            self.console.print(f"[bold red]Quick command error: {e}[/]")
+                    else:
+                        self.console.print(f"[bold red]Quick command '{base_cmd}' has no command defined[/]")
+                else:
+                    self.console.print(f"[bold red]Quick command '{base_cmd}' has unsupported type (only 'exec' is supported)[/]")
+            # Check for skill slash commands (/gif-search, /axolotl, etc.)
+            elif base_cmd in _skill_commands:
                 user_instruction = cmd_original[len(base_cmd):].strip()
                 msg = build_skill_invocation_message(base_cmd, user_instruction)
                 if msg: