refactor: reorganize agent and CLI structure for improved clarity

- Extracted agent internals into a dedicated `agent/` directory, including model metadata, context compression, and prompt handling.
- Enhanced CLI structure by separating banner, commands, and callbacks into distinct modules within `hermes_cli/`.
- Updated README to reflect the new directory organization and clarify the purpose of each component.
- Improved tool registration and terminal execution backends for better maintainability and usability.

hermes_cli/commands.py

@@ -0,0 +1,48 @@
+"""Slash command definitions and autocomplete for the Hermes CLI.
+
+Contains the COMMANDS dict and the SlashCommandCompleter class.
+These are pure data/UI with no HermesCLI state dependency.
+"""
+
+from prompt_toolkit.completion import Completer, Completion
+
+
+COMMANDS = {
+    "/help": "Show this help message",
+    "/tools": "List available tools",
+    "/toolsets": "List available toolsets",
+    "/model": "Show or change the current model",
+    "/prompt": "View/set custom system prompt",
+    "/personality": "Set a predefined personality",
+    "/clear": "Clear screen and reset conversation (fresh start)",
+    "/history": "Show conversation history",
+    "/new": "Start a new conversation (reset history)",
+    "/reset": "Reset conversation only (keep screen)",
+    "/retry": "Retry the last message (resend to agent)",
+    "/undo": "Remove the last user/assistant exchange",
+    "/save": "Save the current conversation",
+    "/config": "Show current configuration",
+    "/cron": "Manage scheduled tasks (list, add, remove)",
+    "/skills": "Search, install, inspect, or manage skills from online registries",
+    "/platforms": "Show gateway/messaging platform status",
+    "/quit": "Exit the CLI (also: /exit, /q)",
+}
+
+
+class SlashCommandCompleter(Completer):
+    """Autocomplete for /commands in the input area."""
+
+    def get_completions(self, document, complete_event):
+        text = document.text_before_cursor
+        if not text.startswith("/"):
+            return
+        word = text[1:]
+        for cmd, desc in COMMANDS.items():
+            cmd_name = cmd[1:]
+            if cmd_name.startswith(word):
+                yield Completion(
+                    cmd_name,
+                    start_position=-len(word),
+                    display=cmd,
+                    display_meta=desc,
+                )