Validated in a combined 5-PR batch worktree off release/v3.8.51 tip.
- Focused test: universal-quota-aware-routing.test.ts — part of batch's 115/115 node:test run
- typecheck:core, file-size, changelog-integrity, complexity, cognitive-complexity — all OK
- Full-repo lint: 228 pre-existing dashboard react-hooks/* findings, unrelated to this diff
Thanks for closing the gap where reset-aware/reset-window/headroom strategies were silently degenerating to round-robin for generic providers because the fetcher registry was never populated at startup — a subtle but real routing-quality regression.