CLAUDE: fopen_export_colmap_poses.py - correct scale note: XML poses are true metres

Dense graveyard model triangulated with our poses puts the ground plane at
z median -77.5 XML-units vs 77.4 m AGL from ELEV_GND - the earlier
'SfM-scale' caveat was an analysis artifact (wrong sub-camera baseline
assumption), retracted.
Co-authored-by: Claude <claude@elphel.com>

scripts/fopen_export_colmap_poses.py

@@ -32,9 +32,9 @@ COLMAP's own free mapper on the same images):
     Flip F = diag(1,-1,-1).
   - COLMAP world->cam:  R = F @ (Ry(az) @ Rx(tilt) @ Rz(roll)).T
     translation:        t = -R @ C,   C = {x,y,z}
-  - The COLMAP world equals the segment-reference camera frame, in
-    "SfM-scale" metres (LY disparity-offset scale — true metric scale comes
-    from the IMS, see project notes).
+  - The COLMAP world equals the segment-reference camera frame, in TRUE
+    metres (IMS-maintained translations; verified 2026-07-11: dense model
+    ground plane at z median -77.5 vs ELEV_GND 77.4 m AGL).
   - Camera: PINHOLE, f = focalLength/pixelSize (13.329114 mm / 12 um =
     1110.7595 px for LWIR16 Boson), c = (width/2, height/2).  Use the
     *-NADIR-MERGED-RECTILINEAR.tiff renders (common radial distortion