fix(formation/NV): name search returns unknown (admin-verify), not a fake result

Nevada's entity search (esos.nv.gov/SilverFlume) is behind Imperva Incapsula bot
protection that blocks headless + the residential proxy IPs, and NV has no public
open-data API/bulk dataset. The old adapter scraped the blocked challenge page and
returned available=False for everything (would tell customers a free name is taken)
and also had a NameError bug (f"${CODE}..."). Now NV detects the Incapsula
challenge and returns available=None ('could not determine') with a note to verify
manually on SilverFlume -- never a false 'taken', so it never wrongly blocks an
order. TX remains fully automated via the open-data API.

scripts/formation/states/nv/adapter.py

@@ -6,7 +6,6 @@ LLC/Corp filing selectors pending live portal verification.
 
 from __future__ import annotations
 
-import re
 
 from scripts.formation.base import (
     StatePortal,
@@ -29,63 +28,50 @@ class NVPortal(StatePortal):
     NWRA_ZIP = CONFIG["nwra_zip"]
 
     async def search_name(self, name: str) -> NameSearchResult:
-        """Search Nevada business name availability via the public portal."""
+        """Nevada business name availability.
+
+        Nevada's entity search (esos.nv.gov / SilverFlume) sits behind Imperva
+        Incapsula bot protection, which blocks automated/headless access (and
+        the residential proxy IPs are flagged too), and Nevada publishes no
+        public open-data API or bulk dataset we can query. So we cannot reliably
+        automate NV name availability the way we do TX (open-data API).
+
+        Rather than scrape a blocked portal and risk a false "available"/"taken",
+        we attempt one lightweight portal hit and, if we get the Incapsula
+        challenge or anything that is not clearly a result page, we return
+        available=None ("could not determine") with a note so the order flow
+        flags it for a manual admin check on SilverFlume. available=None is NEVER
+        treated as "taken", so it never wrongly blocks an order.
+        """
         try:
             page = await self.start_browser()
-            await page.goto(CONFIG["name_search_url"], wait_until="networkidle")
-            await self.human_delay(1.0, 2.5)
-
-            search_sel = (
-                CONFIG["selectors"].get("search_input")
-                or 'input[type="text"], input[name*="earch"], input[name*="ame"]'
-            )
-            await page.fill(search_sel, "")
-            await self.type_slowly(page, search_sel, name)
-            await self.human_delay(0.5, 1.0)
-
-            btn_sel = (
-                CONFIG["selectors"].get("search_button")
-                or 'button[type="submit"], input[type="submit"]'
-            )
-            await page.click(btn_sel)
-            await page.wait_for_load_state("networkidle")
-            await self.human_delay(1.0, 2.0)
-
+            await page.goto(CONFIG["name_search_url"], wait_until="domcontentloaded", timeout=45000)
+            await self.human_delay(2.0, 4.0)
             content = await page.content()
-            await self.screenshot(page, f"${CODE}_name_search_{name}")
+            await self.screenshot(page, f"nv_name_search_{name[:20]}")
 
-            no_results = any(
-                phrase in content.lower()
-                for phrase in ["no match", "no results", "no records", "no entities", "0 results"]
+            blocked = (
+                "_incapsula_resource" in content.lower()
+                or "incapsula" in content.lower()
+                or len(content) < 2000  # challenge stub, not a real page
             )
-
-            if no_results:
+            if blocked:
                 return NameSearchResult(
-                    available=True, exact_match=False, similar_names=[],
-                    state_code="NV", searched_name=name,
-                    raw_response=content[:2000],
+                    available=None, state_code="NV", searched_name=name,
+                    raw_response=(
+                        "NV portal behind Incapsula bot protection - automated "
+                        "name check unavailable. Verify manually on SilverFlume "
+                        "(esos.nv.gov) before filing."
+                    ),
                 )
 
-            similar: list[str] = []
-            pattern = re.compile(r'<td[^>]*>([^<]*?' + re.escape(name[:8]) + r'[^<]*?)</td>', re.IGNORECASE)
-            for m in pattern.finditer(content):
-                found = m.group(1).strip()
-                if found and 3 < len(found) < 200:
-                    similar.append(found)
-
-            exact = any(
-                s.upper().replace(",", "").strip() == name.upper().replace(",", "").strip()
-                for s in similar
-            )
-
             return NameSearchResult(
-                available=not exact, exact_match=exact,
-                similar_names=similar[:10], state_code="NV",
-                searched_name=name, raw_response=content[:2000],
+                available=None, state_code="NV", searched_name=name,
+                raw_response="NV name check inconclusive - verify manually on SilverFlume.",
             )
         except Exception as exc:
             return NameSearchResult(
-                available=False, state_code="NV", searched_name=name,
+                available=None, state_code="NV", searched_name=name,
                 raw_response=f"Error: {exc}",
             )