fix: scope CI pip cache key per Python version - #562
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All Linux/macOS/Windows matrix lanes shared one cache key keyed only on runner.os + pyproject.toml hash. GitHub Actions caches are write-once per key, so once a fast lane (3.10-3.12) populated the cache, every other lane got a cache hit and never saved its own wheels. The 3.13 lane never got to persist its from-source numpy build, so it rebuilt numpy from source (~3min) on every single run instead of reusing a cached wheel.
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All Linux/macOS/Windows matrix lanes shared one cache key keyed only on runner.os + pyproject.toml hash. GitHub Actions caches are write-once per key, so once a fast lane (3.10-3.12) populated the cache, every other lane got a cache hit and never saved its own wheels. The 3.13 lane never got to persist its from-source numpy build, so it rebuilt numpy from source (~3min) on every single run instead of reusing a cached wheel.