perf: concurrent presigned PUTs with semaphore-bounded asyncio.gather
Replace sequential for-loop PUT with asyncio.gather + Semaphore(64). Add _make_r2_client() with keepalive enabled and _run_presign_puts() as a testable unit. TDD: 5 concurrency tests cover timing, keepalive, semaphore cap, completeness, and error propagation.
sha256:36432699cdada4376d8ed47d0d071d76ff0e12c58e0c415d19447562c558bda0
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sha256:d231e10c1748725abd0e0dd81b4573058a463f3e86de530c86453a733c3f0ad1
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