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/tavily/connector.json

@@ -1,7 +1,6 @@
 {
   "id": "tavily",
   "name": "Tavily",
-  "version": "1.0.0",
   "type": "mcp_remote",
   "mcp_config": {
     "url": "https://mcp.tavily.com/mcp/?tavilyApiKey={SECRET:tavilyApiKey}",
@@ -11,25 +10,36 @@
     "command": "python3 verify.py",
     "timeout_secs": 15
   },
-  "docs": [{
-    "lang": "en",
-    "description": "Real-time web search and page extraction via Tavily.",
-    "llm_short_description": "Search the web and extract page content through Tavily."
-  }],
+  "docs": [
+    {
+      "lang": "en",
+      "description": "Real-time web search and page extraction via Tavily.",
+      "llm_short_description": "Search the web and extract page content through Tavily."
+    }
+  ],
   "auth": {
     "type": "api_key"
   },
-  "env": [{
-    "name": "tavilyApiKey",
-    "label": "Tavily API key",
-    "description": "Create one at https://app.tavily.com (your account dashboard).",
-    "required": true,
-    "secret": true,
-    "example": "tvly-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
-  }],
+  "env": [
+    {
+      "name": "tavilyApiKey",
+      "label": "Tavily API key",
+      "description": "Create one at https://app.tavily.com (your account dashboard).",
+      "required": true,
+      "secret": true,
+      "example": "tvly-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
+    }
+  ],
   "homepage": "https://tavily.com",
   "icon_small": "icon_sm.png",
   "icon_large": "icon_lg.png",
   "scope": "global",
-  "tags": ["search", "mcp", "remote"]
+  "tags": [
+    "search",
+    "mcp",
+    "remote"
+  ],
+  "version": 1,
+  "version_string": "1.0.0",
+  "version_release_date": "2026-07-19"
 }