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/config.py

@@ -0,0 +1,38 @@
+"""
+Loki MCP Server - Configuration
+
+This is where we store settings for connecting to your Loki instance.
+We use environment variables with sensible defaults so you can override
+them without editing code.
+
+Environment variables:
+    LOKI_URL        - Base URL for your Loki instance
+    LOKI_TIMEOUT    - Request timeout in seconds (default: 30)
+    LOKI_DEFAULT_LIMIT - Default number of log lines to return (default: 100)
+"""
+
+import os
+
+
+# ---------------------------------------------------------------------------
+# Connection settings
+# ---------------------------------------------------------------------------
+
+# The URL where Loki is reachable. This goes through your Caddy reverse proxy.
+LOKI_URL = os.getenv("LOKI_URL", "https://loki.apophisnetworking.net")
+
+# How long (seconds) to wait for Loki to respond before giving up.
+LOKI_TIMEOUT = int(os.getenv("LOKI_TIMEOUT", "30"))
+
+# ---------------------------------------------------------------------------
+# Query defaults
+# ---------------------------------------------------------------------------
+
+# How many log lines to return if the caller doesn't specify.
+# 100 is a good balance — enough to see what's happening, not so many
+# that it floods the response.
+DEFAULT_LIMIT = int(os.getenv("LOKI_DEFAULT_LIMIT", "100"))
+
+# Default time range for queries if none specified (in hours).
+# "1" means "show me the last hour of logs."
+DEFAULT_RANGE_HOURS = 1