feat: SentinelOne SDL + VirusTotal Hunting integrations

SentinelOne SDL (endpoint): Unified Alerts via the GraphQL API. Alert ingestion
(get_alerts) with rich filtering and an exhaustive OCSF mapper + 'SentinelOne SDL
Alert' default type, full alert details, update (status/verdict/assignee), add
note and trigger mitigation action. ApiToken auth; watermark converted to epoch
ms for the detectedAt filter; alert edges flattened to nodes for ingestion.

VirusTotal Hunting (enrichment, Premium): Livehunt notification-file ingestion
(livehunt_files) with an OCSF mapper + 'VirusTotal Hunting File' default type
(severity bucketed from malicious AV detections), Livehunt notifications listing,
and Retrohunt job + matching-file listing.

The core VT v3 reputation already ships as 'virustotal'; the XSOAR-feed and
Premium file-download/zip/pcap commands were intentionally left out.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

integrations/virustotal-hunting/scripts/test_connection.py

@@ -0,0 +1,38 @@
+import json, os, sys, urllib.request, urllib.parse, urllib.error
+
+
+def _cfg():
+    s = json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+    base = str(s.get("base_url") or "https://www.virustotal.com/api/v3").rstrip("/")
+    headers = {"x-apikey": s.get("api_key", ""), "Accept": "application/json"}
+    return base, headers
+
+
+def request(path, params):
+    base, headers = _cfg()
+    clean = {k: v for k, v in params.items() if v not in (None, "")}
+    url = base + "/" + path.lstrip("/") + ("?" + urllib.parse.urlencode(clean, doseq=True) if clean else "")
+    req = urllib.request.Request(url, headers=headers, method="GET")
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        return json.loads(raw) if raw else {}
+
+
+def run():
+    request("intelligence/hunting_rulesets", {"limit": 1})
+    print(json.dumps({"ok": True}))
+
+
+try:
+    run()
+except urllib.error.HTTPError as e:
+    detail = e.read().decode("utf-8", "replace")
+    if e.code in (401, 403):
+        msg = "API key is not valid or lacks Hunting (Premium) access."
+    else:
+        msg = "HTTP " + str(e.code)
+    print(json.dumps({"ok": False, "error": msg, "detail": detail}))
+    sys.exit(1)
+except Exception as e:
+    print(json.dumps({"ok": False, "error": str(e)}))
+    sys.exit(1)