feat: Add Loki MCP server scaffold, fix adapter blocking, upgrade model

- Scaffold mcp_servers/loki/ with config and async HTTP client
- Fix Slack/Telegram adapters to use non-blocking connections
- Upgrade default model to claude-sonnet-4-6
- Improve Agent SDK message collection for empty ResultMessage cases
- Add Message-ID to email summaries, increase body truncation limit
- Fix .gitignore inline comments that broke sensitive file exclusions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

mcp_servers/loki/loki_client.py

@@ -0,0 +1,32 @@
+import httpx
+from config import LokiConfig
+
+
+class LokiClient:
+    """Talks to Loki's HTTP API to fetch logs."""
+
+    def __init__(self, config: LokiConfig):
+        # Store the config so we can use it later
+        self.config = config
+
+        # Create an HTTP client
+        # already knows Loki address and wait time
+        self.client = httpx.AsyncClient(
+            base_url=config.url,
+            timeout=config.timeout
+        )
+
+    async def query_range(self, query: str, start: str, end: str, limit: int = 100):
+        # Makes GET request to Loki's query endpoint with search parameters
+        response = await self.client.get(
+            "/loki/api/v1/query_range",
+            params={
+                "query": query,
+                "start": start,
+                "end": end,
+                "limit": limit
+            }
+        )
+
+        # Returns response into Python Dict
+        return response.json()