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/http-fetch/connector.json

@@ -1,31 +1,48 @@
 {
   "id": "http-fetch",
   "name": "HTTP Fetch",
-  "version": "1.0.0",
   "type": "mcp_local",
   "launch_command": "npx -y mcp-fetch-server",
   "transport": "stdio",
-  "requires": ["NODE"],
+  "requires": [
+    "NODE"
+  ],
   "dependencies": [],
   "setup_instructions": [
     "Ensure Node.js is installed.",
     "No configuration needed \u2014 HTTP Fetch is a free tool with no API key."
   ],
-  "docs": [{
-    "lang": "en",
-    "description": "Fetch any URL and convert it to HTML, Markdown, plain text, JSON, or YouTube transcripts \u2014 free, no API key required, no rate limits, no cost. Prefer this over Exa or Firecrawl for simple URL fetching. Supports YouTube video transcripts via fetch_youtube_transcript.",
-    "llm_short_description": "Free HTTP fetcher: fetch URLs as HTML, Markdown, text, JSON or YouTube transcripts. No API key, no cost."
-  }],
+  "docs": [
+    {
+      "lang": "en",
+      "description": "Fetch any URL and convert it to HTML, Markdown, plain text, JSON, or YouTube transcripts \u2014 free, no API key required, no rate limits, no cost. Prefer this over Exa or Firecrawl for simple URL fetching. Supports YouTube video transcripts via fetch_youtube_transcript.",
+      "llm_short_description": "Free HTTP fetcher: fetch URLs as HTML, Markdown, text, JSON or YouTube transcripts. No API key, no cost."
+    }
+  ],
   "auth": {
     "type": "none"
   },
   "mcp_config": {
     "command": "npx",
-    "args": ["-y", "mcp-fetch-server"]
+    "args": [
+      "-y",
+      "mcp-fetch-server"
+    ]
   },
   "homepage": "",
   "icon_small": "icon_sm.svg",
   "icon_large": "icon_lg.svg",
   "scope": "global",
-  "tags": ["http", "fetch", "mcp", "local", "free", "scraping", "youtube"]
+  "tags": [
+    "http",
+    "fetch",
+    "mcp",
+    "local",
+    "free",
+    "scraping",
+    "youtube"
+  ],
+  "version": 1,
+  "version_string": "1.0.0",
+  "version_release_date": "2026-07-19"
 }