feat: parallel exports download + progress bar - #21
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`wk exports download` now fetches clips concurrently (default 8, tune via `--concurrency`) and renders an animated `[████░░] cur/total · M:SS` bar instead of printing every-25 status lines. The previous "single- threaded by design" comment was based on a misread of the platform — clip GETs go through a Cloudflare Worker which scales across isolates, so concurrency is a real win. Skipped clips (`--force=false` resume) tick the bar immediately so already-downloaded files don't make progress look stalled.
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Summary
wk exports downloadfetches clips concurrently (--concurrency, default 8) instead of one-at-a-timeProgressBarinsrc/progress.rsrenders[████░░] cur/total · M:SSon stderr; old "downloaded N clip(s)…" lines removedAGENTS.mdquirks updated; the "single-threaded by design" claim was wrong — Workers scale across isolates per region, so concurrency is a real winTest plan
cargo test— 35 passed (3 new bar render tests)cargo buildcleanwk exports download <id>against a real export, verify bar animates and--concurrency 1falls back to serial behaviorNO_COLOR=1 wk exports download <id>prints no bar; non-TTY pipe stays clean--force=falseimmediately ticks skipped clips toward total