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A self-contained `src/library/pools.ts`: a generic `BoundedPool` concurrency limiter and a `RequestPools` bundle of three at the design's caps (metadata 10, content 5, thumbnails 25, each overridable). Within a pool, on-demand work is served before background/precache work, first-come-first-served within a priority; a task submitted under a `key` already pending is shared rather than run twice, and the key frees the moment that task settles. The slot is held for the task's whole lifetime, so a request that retries internally stays counted against the cap between attempts. Pools only; nothing wires them into `Library` yet — that is a later unit. Model: opus-4-8