Add fail-closed AI web research discovery provider

apps/api/app/discovery.py

@@ -13,7 +13,9 @@ from urllib.parse import urljoin, urldefrag, urlparse
 
 from .contact_extractor import extract_contacts
 from .website_scanner import MAX_BYTES, MAX_REDIRECTS, _fetch, validate_url
-from .search_provider import search as search_provider
+import os
+from .ai_research import research as ai_research
+from .search_provider import search as search_provider  # deprecated compatibility adapter
 
 MAX_SEEDS = 5
 MAX_PAGES = 20
@@ -69,8 +71,17 @@ def discover(criteria, seed_urls=None, *, max_pages=MAX_PAGES, max_candidates=MA
     except (TypeError, ValueError): raise ValueError("invalid_limits")
     if not 1 <= max_pages <= MAX_PAGES or not 1 <= max_candidates <= MAX_CANDIDATES: raise ValueError("invalid_limits")
     if seed_urls is None:
-        seeds = search_provider(criteria, max_candidates)
-        mechanism = "criteria_search_provider"
+        try:
+            seeds = ai_research(criteria, max_candidates)
+            mechanism = "ai_web_research_provider"
+        except Exception as exc:
+            # SEARCH_PROVIDER_* is retained only as a migration adapter. It is
+            # never reported as the primary provider and can be removed later.
+            if os.environ.get("SEARCH_PROVIDER_URL", "").strip() and getattr(exc, "args", (None,))[0] == "not_configured":
+                seeds = search_provider(criteria, max_candidates)
+                mechanism = "criteria_search_provider"  # legacy provenance label
+            else:
+                raise
     else:
         if not isinstance(seed_urls, list) or not 0 < len(seed_urls) <= MAX_SEEDS: raise ValueError("seed_urls_required")
         seeds = list(seed_urls)