fix(sports): recover from ESPN rejecting scoreboard date ranges (#591)

* fix(sports): recover from ESPN rejecting scoreboard date ranges

Since 2026-09-15 ESPN's site API answers `dates=YYYYMMDD-YYYYMMDD` with
400 "Failed to get events endpoint." for every sport. Single days, months
(`YYYYMM`) and season years still work. Every season and weeks-window fetch
in core failed, including the background service the scoreboards submit
their season schedules to.

src/common/espn_dates.py re-asks a rejected range as whole-month chunks
plus the leftover edge days, which tile the window exactly (a season is
8 requests, not 213). A month that comes back with exactly 500 events is
truncated (college baseball's March) and is re-asked day by day.

It also clamps `limit` to 500: above that ESPN truncates silently, e.g.
college football returns 25 of 68 games for one Saturday at limit=1000.

BackgroundDataService recovers rejected ranges on the worker thread and
advertises `handles_espn_date_ranges` so plugins can tell whether to hand
it a range. SportsCore, sports_shared, ESPNDataSource and APIHelper route
through the helper or the clamped limit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* docs(changelog): ESPN date-range fallback and limit clamp

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* fix(sports): stop re-sending ESPN date ranges once one is rejected

Live scoreboards refresh every 30 seconds, and each refresh sent the range
first, got the 400, then fetched the chunks: three requests where one used
to do. After a rejection, ranges now go straight to chunks for six hours,
then the range is tried again so the workaround retires itself if ESPN
reverts. A single-day 400 does not set the memo, and when every chunk fails
the range request supplies the error without the chunks being fetched a
second time. Per-fetch chunk logging drops to debug; the rejection itself
stays a warning.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

* fix(sports): clamp limit only on ESPN scoreboard submissions

The background service is generic, and limit above 500 only truncates
scoreboards. /teams needs limit=1000 (college football has 762 teams and
limit=500 returns 500), so a teams submission must keep its limit.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

src/base_classes/data_sources.py

@@ -10,6 +10,7 @@ from typing import Dict, List
 import requests
 import logging
 from datetime import datetime
+from src.common.espn_dates import fetch_espn_scoreboard
 
 class DataSource(ABC):
     """Abstract base class for data sources."""
@@ -71,10 +72,10 @@ class ESPNDataSource(DataSource):
             now = datetime.now()
             formatted_date = now.strftime("%Y%m%d")
             url = f"{self.base_url}/{sport}/{league}/scoreboard"
-            response = self.session.get(url, params={"dates": formatted_date, "limit": 1000}, headers=self.get_headers(), timeout=15)
-            response.raise_for_status()
-            
-            data = response.json()
+            data = fetch_espn_scoreboard(
+                self.session, url, params={"dates": formatted_date, "limit": 1000},
+                headers=self.get_headers(), timeout=15, logger=self.logger,
+            )
             events = data.get('events', [])
             
             # Filter for live games
@@ -99,10 +100,10 @@ class ESPNDataSource(DataSource):
                 "limit": 1000
             }
             
-            response = self.session.get(url, headers=self.get_headers(), params=params, timeout=15)
-            response.raise_for_status()
-            
-            data = response.json()
+            data = fetch_espn_scoreboard(
+                self.session, url, params=params,
+                headers=self.get_headers(), timeout=15, logger=self.logger,
+            )
             events = data.get('events', [])
             
             self.logger.debug(f"Fetched {len(events)} scheduled games for {sport}/{league}")