Migliorate llm_short_description per tutti i connector — tool names espliciti

Ogni connector.json ora ha una llm_short_description che elenca i tool
specifici che espone, così l'LLM sa esattamente cosa attivare (lazy load).

SKALD.md: documentata criticità del campo llm_short_description
nel system prompt dell'LLM.

connectors/ssh/connector.json

@@ -76,7 +76,7 @@
     {
       "lang": "en",
       "description": "Full SSH remote server access: read/write files, grep, execute commands, manage systemd services, upload/download files and directories, and probe system info \u2014 all over SFTP and SSH with the same output format as Skald's native tools. Aliases manage host config (hostname, port, user, auth method, sudo policy). Login passwords and sudo passwords are elicited on demand and kept only in RAM with configurable TTL. No OAuth, no API keys, no secrets on disk.",
-      "llm_short_description": "SSH MCP server: 13 tools (list/add/remove_alias, read_file, list_files, grep_files, edit_file, replace_lines, exec, upload, download, sysinfo, systemd). Auth via key/agent or elicited password. Sudo via nopasswd or elicited password. Connection pooling with lazy TTL eviction."
+      "llm_short_description": "SSH remote server management via alias system. 13 tools: list_aliases, add/remove_alias (manage SSH hosts), read_file, list_files (recursive), grep_files (regex search), edit_file, replace_lines, exec (run commands), upload/download (file transfer via SFTP), sysinfo (host metrics), systemd (service management). Auth via key/agent or elicited password. Connection pooling with lazy TTL eviction."
     }
   ],
   "mcp_config": {