fix(taps): align with integrator resilience patterns

Port critical patterns from the working integrator into Singer taps:
- GIAS: add 404 fallback to yesterday's date, increase timeout to 300s,
  use latin-1 encoding, use dated URL for links (static URL returns 500)
- FBIT: add GIAS date fallback, increase timeout, fix encoding to latin-1
- IDACI: use dated GIAS URL with fallback instead of undated static URL,
  fix encoding to latin-1, increase timeout to 300s
- Ofsted: try utf-8-sig then fall back to latin-1 encoding

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

pipeline/plugins/extractors/tap-uk-idaci/tap_uk_idaci/tap.py

@@ -103,17 +103,29 @@ class IDACIStream(Stream):
 
     def _get_school_postcodes(self) -> list[tuple[int, str]]:
         """Fetch URN + postcode pairs from GIAS."""
-        url = (
+        from datetime import date, timedelta
+
+        today = date.today()
+        base = (
             "https://ea-edubase-api-prod.azurewebsites.net"
-            "/edubase/downloads/public/edubasealldata.csv"
+            "/edubase/downloads/public/edubasealldata{date}.csv"
         )
+        url = base.format(date=today.strftime("%Y%m%d"))
         self.logger.info("Fetching school postcodes from GIAS...")
-        resp = requests.get(url, timeout=120)
+        resp = requests.get(url, timeout=300)
+
+        # Fall back to yesterday if today's file isn't available
+        if resp.status_code == 404:
+            yesterday = (today - timedelta(days=1)).strftime("%Y%m%d")
+            url = base.format(date=yesterday)
+            self.logger.info("Today's GIAS file not available, trying yesterday: %s", url)
+            resp = requests.get(url, timeout=300)
+
         resp.raise_for_status()
 
         df = pd.read_csv(
             io.StringIO(resp.text),
-            encoding="utf-8-sig",
+            encoding="latin-1",
             usecols=["URN", "Postcode", "EstablishmentStatus (name)"],
             dtype=str,
         )