fix: playtomic pagination stale-page exit + calculator test assertions

Playtomic tenants API recycles results past its internal limit —
stop after 3 consecutive pages with zero new unique IDs.

Calculator tests: replace hardcoded default values (6 courts, specific
sqm/capex) with DEFAULTS references so tests don't break when
defaults change.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

extract/padelnomics_extract/src/padelnomics_extract/playtomic_tenants.py

@@ -26,6 +26,7 @@ PLAYTOMIC_TENANTS_URL = "https://api.playtomic.io/v1/tenants"
 THROTTLE_SECONDS = 2
 PAGE_SIZE = 20
 MAX_PAGES_PER_BBOX = 500  # safety bound — prevents infinite pagination
+MAX_STALE_PAGES = 3  # stop after N consecutive pages with zero new results
 
 # Target markets: Spain, UK/Ireland, Germany, France
 BBOXES = [
@@ -51,6 +52,7 @@ def extract(
     seen_ids: set[str] = set()
 
     for bbox in BBOXES:
+        stale_pages = 0
         for page in range(MAX_PAGES_PER_BBOX):
             params = {
                 "sport_ids": "PADEL",
@@ -94,6 +96,15 @@ def extract(
             if len(tenants) < PAGE_SIZE:
                 break
 
+            # API recycles results past its internal limit — stop early
+            if new_count == 0:
+                stale_pages += 1
+                if stale_pages >= MAX_STALE_PAGES:
+                    logger.info("stopping bbox after %d stale pages", stale_pages)
+                    break
+            else:
+                stale_pages = 0
+
             time.sleep(THROTTLE_SECONDS)
 
     payload = json.dumps({"tenants": all_tenants, "count": len(all_tenants)}).encode()