Add versioning schema: version (int), version_string, version_release_date to all 10 connectors

- version: intero per-connector (parte da 1)
- version_string: semver ereditato (display only)
- version_release_date: ISO 8601 (display only)
- Campi identici in index (connectors.json) e manifest (connector.json)
- Aggiunto connector.json alle files[] di gmail, gcal, email, ssh, tavily
- Aggiornata documentazione in SKALD.md

connectors/ssh/connector.json

@@ -1,7 +1,6 @@
 {
   "id": "ssh",
   "name": "SSH Remote Access",
-  "version": "1.0.0",
   "type": "mcp_local",
   "launch_command": "python3 ssh_mcp_server.py",
   "transport": "stdio",
@@ -76,7 +75,7 @@
   "docs": [
     {
       "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 — 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.",
+      "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."
     }
   ],
@@ -109,5 +108,8 @@
   ],
   "auth": {
     "type": "none"
-  }
+  },
+  "version": 1,
+  "version_string": "1.0.0",
+  "version_release_date": "2026-07-19"
 }