feat(data): add near-duplicate gloss frame detector (Fixes #246) [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH] - #576
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…unties#246) Add a batch detector for near-duplicate gloss frame sequences. - Bucket samples by (frame_count, feature_dim) for fast filtering - Exact time-aligned landmark distance per candidate pair - New 'loru data near-dup' CLI with table output and --out JSON report - Tests: core detector + CLI, 9 new passing tests [FaaFyfxR9WAQrL7FcAgEHJvztd8cVMxvjHRS55rw1nwH]
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Implements the batch near-duplicate gloss frame detector requested in #246.
Strategy: bucket samples by (frame_count, feature_dim) for fast filtering, then exact time-aligned landmark distance per candidate pair, plus cross-bucket neighbour scan (frame count +/- 1) for offset clones.
Changes:
Verification: 15 passed (9 new + 6 pre-existing compare/samples tests) in 0.37s.
Fixes #246