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/1-hot.2/1-hot.2.Layer.2.bv.dat

@@ -0,0 +1,3 @@
+ARMA_MAT_TXT_FN008
+1 16
+   3.6149059322307671e+00  -1.1281637755265841e+00   4.1575360000619099e+00   2.3311743114108752e+00   5.9860800251846247e-01  -7.2371416921552922e-01  -3.6954133733412129e+00  -3.7540556822114026e+00   4.5348766248875458e+00   7.4776676599844345e+00   1.2403433967460273e+01  -3.5672586082768842e+00  -1.2179700002116274e+00  -3.1880913207912425e+00  -9.8106440877980028e-01  -1.8984417865910458e-02