Remove redundant scene import during bundle adjustment - #18
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Changes
Remove the redundant scene import after depth lifting in BA retriangulation. The next solve already imports the reconstruction after track completion and merging, so the intermediate copy is unused.
Impact
Shortened LaMAR HGE sequence: 589 images, 122 keyframes.
Mapping: 104.37 ± 0.25 → 101.95 ± 0.03 s, a 2.3% reduction (mean ± sample SD, three local runs each, eight solver threads). This removes nine full scene imports on that schedule.