Fetch service stage 2: one ESPN scoreboard cache key shared across the sports base classes (legacy keys still read), and a max-age response cache in the fetch service.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Core's own HTTP fetch paths (APIHelper, fetch_espn_scoreboard and its date chunks, BackgroundDataService, BaseOddsManager.get_odds) go through one service in src/common/fetch_service.py: shared connection pools per retry policy, merged identical in-flight GETs, per-host token-bucket budgets (fetch_service.rate_limits), and per-plugin request counters published to GET /api/v3/plugins/fetch-stats. Return values, exceptions, cache keys, TTLs and retry policies are unchanged. Core-internal in this release; plugins should not import it directly yet.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
