TractX: FDC filename and header mismatch

PRE.mif vs IN.mif again... right next to 'header transformations ... do not match'
check template + correspondence + directions/index files. renaming it won't fix the space it's in

pipeline context: step 19 writes fiber-density correspondence to ../template/fd/PRE.mif; step 20 writes cross-section to ../template/fc/IN.mif. Step 21 multiplies them:

FDC inputs and the mismatching-header warning.
FDC inputs and the mismatching-header warning.

mrcalc ../template/fd/PRE.mif ../template/fc/IN.mif \
  -mult ../template/fdc/IN.mif

The source explicitly flags that the FD input was expected to be IN.mif and records: header transformations of input images do not match.

debug checklist: determine whether PRE and IN refer to the same subject/stage; compare transforms and fixel correspondence; check that copied index.mif and directions.mif belong to the same template as both arrays. Do not simply rename a file to suppress the mismatch.

related steps: fixelcorrespondence, warp2metric, and FOD warping/reorientation. The issue is upstream of interpreting the combined FDC values. This entry records an unresolved warning, not a verified correction.

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