feat(sekoia): Sekoia XDR + SEKOIA Intelligence Center integrations

Sekoia XDR (siem): alert ingestion (list_alerts) with an exhaustive OCSF mapper
and a bundled 'Sekoia XDR Alert' default type, plus 20 commands across alerts
(list/get/search, status workflow, comments), event search jobs (create/status/
results + one-shot search_events), cases, asset management, users, kill chains
and a generic authenticated HTTP passthrough. Bearer-token auth, EU host default.

SEKOIA Intelligence Center (enrichment): observable/indicator/indicator-context
CTI queries plus ip/url/domain/file/email reputation lookups (STIX type resolved
automatically). No fetch.

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

integrations/sekoia-intelligence-center/scripts/test_connection.py

@@ -0,0 +1,33 @@
+import json, os, sys, urllib.request, urllib.parse, urllib.error
+
+
+def _cfg():
+    s = json.loads(os.environ.get("INTEGRATION_SECRETS", "{}"))
+    base = str(s.get("url") or "https://api.sekoia.io").rstrip("/")
+    headers = {"Authorization": "Bearer " + s.get("api_key", ""), "Accept": "application/json"}
+    return base, headers
+
+
+def request(method, path):
+    base, headers = _cfg()
+    req = urllib.request.Request(base + "/" + path.lstrip("/"), headers=headers, method=method)
+    with urllib.request.urlopen(req, timeout=60) as r:
+        raw = r.read()
+        return json.loads(raw) if raw else {}
+
+
+def run():
+    request("GET", "/v1/auth/validate")
+    print(json.dumps({"ok": True}))
+
+
+try:
+    run()
+except urllib.error.HTTPError as e:
+    detail = e.read().decode("utf-8", "replace")
+    msg = "API key is not valid." if e.code in (401, 403) else "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)