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Feature/imos downloader - #170
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New provider bluemath_tk.downloaders.imos: lists a bucket prefix with S3 ListObjectsV2 (paged, sub-folders in parallel, modified_since), mirrors the files locally, parallel and resumable, checked against the size and the ETag (MD5). A file is downloaded again when its size changes or the bucket copy is newer (local files get the bucket time). Product SRS with dataset Wave-Wind-Altimetry-DM00 (18 altimeter missions, 1985-now). file_checksum moves to _transfer (shared with earthdata). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ds of files add_* and merge checked "file not in list", which is quadratic: a dry run of the IMOS archive (736,000 files) did not finish in 10 min. A set next to each list makes the check O(1) (rebuilt if a list is changed directly). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…tat per file On Lustre, 736,000 stat calls of missing files took over 30 min; with one os.scandir per folder the dry run of the whole IMOS archive takes 1 min. Dry runs no longer stat missing files a second time in fetch_file. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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