Migrate all project files from repo root into prj/<name>/

Moved all 40 existing projects' .prj/.dat files (Layer weights, training
batches, legacy .weights.dat/.test.dat artifacts) from the flat repo root
into their own prj/<name>/ folder via git mv, matching the new path
convention from the previous commit. Filenames are unchanged, only the
directory. Non-project files at root (CLAUDE.md, Makefile, batch/moby
text corpora, the stray Layer.0.training.mat) were left in place.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016K8Gu7Qejd11JbdiHZqYAs

prj/test0/test0.Layer.0.bh.dat

@@ -0,0 +1,3 @@
+ARMA_MAT_TXT_FN008
+1 8
+   4.4844422340393066e+00   2.8253679275512695e+00   4.9161839485168457e+00   2.9384939670562744e+00   4.0367131233215332e+00   1.9692490100860596e+00   3.9220330715179443e+00   2.5767068862915039e+00