Add SSH MCP server and Gmail attachment download

Features:
- SSH MCP server with two tools:
  * ssh_execute: Run commands on remote hosts via SSH
  * ssh_file_upload: Upload files via SFTP
- Support for both password and SSH key authentication
- Auto-accept SSH host keys (AutoAddPolicy) for homelab use
- Gmail attachment download functionality
- Added download_attachment tool for Gmail API

Technical changes:
- Created mcp_servers/mcp_ssh.py with MCP-compliant text output
- Updated llm_interface.py to load SSH MCP server
- Added paramiko>=3.4.0 to requirements.txt
- Updated .env.example with SSH configuration template
- Enhanced gmail_client.py with download_attachment() method
- Added download_attachment tool handler in tools.py

SSH credentials configured via environment variables:
- PROXMOX_SSH_HOST, PROXMOX_SSH_USER, PROXMOX_SSH_PORT
- PROXMOX_SSH_PASSWORD (or) PROXMOX_SSH_KEY_FILE

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

llm_interface.py

@@ -41,6 +41,7 @@ if not logger.handlers:
 # Try to import Agent SDK (optional dependency)
 try:
     from claude_agent_sdk import (
+        AssistantMessage,
         ClaudeAgentOptions,
         ResultMessage,
     )
@@ -345,8 +346,12 @@ class LLMInterface:
         """
         try:
             from mcp_tools import file_system_server
+            from mcp_servers.mcp_ssh import ssh_mcp_server
 
-            mcp_servers = {"file_system": file_system_server}
+            mcp_servers = {
+                "file_system": file_system_server,
+                "ssh": ssh_mcp_server,
+            }
 
             # All tools registered in the MCP server
             allowed_tools = [
@@ -356,6 +361,9 @@ class LLMInterface:
                 "edit_file",
                 "list_directory",
                 "run_command",
+                # SSH tools
+                "ssh_execute",
+                "ssh_file_upload",
                 # Web tool
                 "web_fetch",
                 # Zettelkasten tools
@@ -404,6 +412,46 @@ class LLMInterface:
             except Exception as e:
                 print(f"[LLM] Obsidian MCP unavailable: {e}")
 
+            # Conditionally add Cloudflare Code Mode MCP server
+            try:
+                from mcp_servers.cloudflare.cloudflare_mcp import (
+                    is_cloudflare_enabled,
+                    get_cloudflare_server_config,
+                    CLOUDFLARE_TOOLS,
+                )
+
+                if is_cloudflare_enabled():
+                    cloudflare_config = get_cloudflare_server_config()
+                    mcp_servers["cloudflare"] = cloudflare_config
+                    allowed_tools.extend(CLOUDFLARE_TOOLS)
+                    print("[LLM] Cloudflare MCP server registered (2 tools: search, execute)")
+                else:
+                    print("[LLM] Cloudflare MCP disabled or no API token set")
+            except ImportError:
+                pass
+            except Exception as e:
+                print(f"[LLM] Cloudflare MCP unavailable: {e}")
+
+            # Conditionally add Loki MCP server (homelab log querying)
+            try:
+                from mcp_servers.loki.loki_mcp import (
+                    is_loki_enabled,
+                    get_loki_server_config,
+                    LOKI_TOOLS,
+                )
+
+                if is_loki_enabled():
+                    loki_config = get_loki_server_config()
+                    mcp_servers["loki"] = loki_config
+                    allowed_tools.extend(LOKI_TOOLS)
+                    print(f"[LLM] Loki MCP server registered ({len(LOKI_TOOLS)} tools: {', '.join(LOKI_TOOLS)})")
+                else:
+                    print("[LLM] Loki MCP disabled")
+            except ImportError:
+                pass
+            except Exception as e:
+                print(f"[LLM] Loki MCP unavailable: {e}")
+
             def _stderr_callback(line: str) -> None:
                 """Log Claude CLI stderr for debugging transport failures."""
                 logger.debug("[CLI stderr] %s", line)
@@ -517,15 +565,20 @@ class LLMInterface:
 
                     # Collect text from AssistantMessage objects
                     if isinstance(message, AssistantMessage):
+                        logger.debug(f"[LLM] AssistantMessage: has_content={hasattr(message, 'content')}")
                         if hasattr(message, 'content') and message.content:
                             # Extract text from content blocks
                             if isinstance(message.content, str):
                                 assistant_messages.append(message.content)
+                                logger.debug(f"[LLM] → Collected string: {len(message.content)} chars")
                             elif isinstance(message.content, list):
                                 for block in message.content:
                                     if hasattr(block, 'type') and block.type == 'text':
                                         if hasattr(block, 'text'):
                                             assistant_messages.append(block.text)
+                                            logger.debug(f"[LLM] → Collected text block: {len(block.text)} chars")
+                        else:
+                            logger.debug(f"[LLM] → AssistantMessage has no content or empty")
 
                     if isinstance(message, ResultMessage):
                         # Use ResultMessage.result if available, otherwise use collected assistant messages
@@ -537,7 +590,9 @@ class LLMInterface:
                             getattr(message, "num_turns", "?"),
                         )
                         if not message.result and assistant_messages:
-                            logger.debug(f"[LLM] ResultMessage.result was empty, using {len(assistant_messages)} collected assistant messages")
+                            logger.info(f"[LLM] ResultMessage.result was empty, using {len(assistant_messages)} collected assistant messages")
+                        elif not message.result and not assistant_messages:
+                            logger.warning(f"[LLM] PROBLEM: Both ResultMessage.result and assistant_messages are empty!")
                         break
 
                     # Log non-result messages to detect loops