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/context7/connector.json

@@ -19,8 +19,8 @@
   "docs": [
     {
       "lang": "en",
-      "description": "Up-to-date documentation and code examples for any library, framework, SDK, API, CLI tool, or cloud service — fetched directly from the source. Works without an API key on the free tier. Supports library lookup and version-specific documentation retrieval.",
-      "llm_short_description": "Fetch up-to-date documentation and code examples for libraries and frameworks. Tools: resolve-library-id (look up a library by name), query-docs (retrieve docs for a known library ID)."
+      "description": "Up-to-date documentation and code examples for any library, framework, SDK, API, CLI tool, or cloud service \u2014 fetched directly from the source. Works without an API key on the free tier. Supports library lookup and version-specific documentation retrieval.",
+      "llm_short_description": "Up-to-date documentation and code examples for programming libraries and frameworks (free tier, no API key). Tools: resolve-library-id (look up a library or framework by name, returns its stable ID), query-docs (retrieve documentation + code examples for a known library ID by topic or function). Covers 800+ popular OSS libraries. Best for getting current API docs, usage examples, and version-specific references."
     }
   ],
   "mcp_config": {
@@ -44,4 +44,4 @@
       "display_name": "Query Docs"
     }
   ]
-}
+}